feat(fallbacks): add per-rule dest override

Operators can now type an explicit dest (e.g. "8443", "127.0.0.1:8443",
"/dev/shm/x.sock") on each fallback row to override the auto-resolved
child listen+port. Empty keeps the existing auto behavior.

Adds the column to inbound_fallbacks (GORM AutoMigrate), threads it
through the panel form, API docs, and translations.

database/model/model.go

@@ -513,11 +513,6 @@ type ClientInbound struct {
 
 func (ClientInbound) TableName() string { return "client_inbounds" }
 
-// InboundFallback is one routing rule on a master inbound's
-// settings.fallbacks array. The master is always a VLESS or Trojan
-// inbound on TCP transport with TLS or Reality. The child is any other
-// inbound — its listen+port becomes the fallback dest, with optional
-// SNI/ALPN/path match criteria pulled from the same row.
 type InboundFallback struct {
 	Id        int    `json:"id" gorm:"primaryKey;autoIncrement"`
 	MasterId  int    `json:"masterId" gorm:"index;not null;column:master_id"`
@@ -525,6 +520,7 @@ type InboundFallback struct {
 	Name      string `json:"name"`
 	Alpn      string `json:"alpn"`
 	Path      string `json:"path"`
+	Dest      string `json:"dest"`
 	Xver      int    `json:"xver"`
 	SortOrder int    `json:"sortOrder" gorm:"default:0;column:sort_order"`
 }

database/model/model_test.go

@@ -188,4 +188,3 @@ func TestInboundClientIpsUnmarshalJSONAcceptsBothShapes(t *testing.T) {
 		})
 	}
 }
-

frontend/public/openapi.json

@@ -863,7 +863,7 @@
         "tags": [
           "Inbounds"
         ],
-        "summary": "List the fallback rules attached to a master VLESS/Trojan TCP-TLS inbound. Each rule links one child inbound (the dest) to optional SNI/ALPN/path/xver match criteria.",
+        "summary": "List the fallback rules attached to a master VLESS/Trojan TCP-TLS inbound. Each rule links one child inbound (the dest) to optional SNI/ALPN/path/dest/xver match criteria. When dest is empty the child inbound's listen+port is used.",
         "operationId": "get_panel_api_inbounds_id_fallbacks",
         "parameters": [
           {
@@ -903,6 +903,7 @@
                       "name": "",
                       "alpn": "",
                       "path": "/vlws",
+                      "dest": "",
                       "xver": 2,
                       "sortOrder": 0
                     }
@@ -946,7 +947,8 @@
                   },
                   {
                     "childId": 12,
-                    "alpn": "h2"
+                    "alpn": "h2",
+                    "dest": "8443"
                   }
                 ]
               }

frontend/src/pages/api-docs/endpoints.ts

@@ -199,12 +199,12 @@ export const sections: readonly Section[] = [
       {
         method: 'GET',
         path: '/panel/api/inbounds/:id/fallbacks',
-        summary: 'List the fallback rules attached to a master VLESS/Trojan TCP-TLS inbound. Each rule links one child inbound (the dest) to optional SNI/ALPN/path/xver match criteria.',
+        summary: 'List the fallback rules attached to a master VLESS/Trojan TCP-TLS inbound. Each rule links one child inbound (the dest) to optional SNI/ALPN/path/dest/xver match criteria. When dest is empty the child inbound\'s listen+port is used.',
         params: [
           { name: 'id', in: 'path', type: 'number', desc: 'Master inbound ID.' },
         ],
         response:
-          '{\n  "success": true,\n  "obj": [\n    {\n      "id": 1,\n      "masterId": 10,\n      "childId": 11,\n      "name": "",\n      "alpn": "",\n      "path": "/vlws",\n      "xver": 2,\n      "sortOrder": 0\n    }\n  ]\n}',
+          '{\n  "success": true,\n  "obj": [\n    {\n      "id": 1,\n      "masterId": 10,\n      "childId": 11,\n      "name": "",\n      "alpn": "",\n      "path": "/vlws",\n      "dest": "",\n      "xver": 2,\n      "sortOrder": 0\n    }\n  ]\n}',
       },
       {
         method: 'POST',
@@ -212,9 +212,9 @@ export const sections: readonly Section[] = [
         summary: 'Replace the entire fallback list for a master inbound. Body is JSON. Triggers an Xray restart.',
         params: [
           { name: 'id', in: 'path', type: 'number', desc: 'Master inbound ID.' },
-          { name: 'fallbacks', in: 'body (json)', type: 'object[]', desc: 'Array of {childId, name, alpn, path, xver, sortOrder} entries.' },
+          { name: 'fallbacks', in: 'body (json)', type: 'object[]', desc: 'Array of {childId, name, alpn, path, dest, xver, sortOrder} entries. Leave dest empty to auto-resolve from the child inbound\'s listen+port; set it (e.g. "8443", "127.0.0.1:8443", "/dev/shm/x.sock") to override.' },
         ],
-        body: '{\n  "fallbacks": [\n    { "childId": 11, "path": "/vlws", "xver": 2 },\n    { "childId": 12, "alpn": "h2" }\n  ]\n}',
+        body: '{\n  "fallbacks": [\n    { "childId": 11, "path": "/vlws", "xver": 2 },\n    { "childId": 12, "alpn": "h2", "dest": "8443" }\n  ]\n}',
         response: '{\n  "success": true,\n  "msg": "Inbound updated"\n}',
       },
     ],

frontend/src/pages/inbounds/InboundFormModal.tsx

@@ -365,13 +365,21 @@ export default function InboundFormModal({
       return;
     }
     setFallbacks(
-      (msg.obj as { childId: number; name?: string; alpn?: string; path?: string; xver?: number }[])
+      (msg.obj as {
+        childId: number;
+        name?: string;
+        alpn?: string;
+        path?: string;
+        dest?: string;
+        xver?: number;
+      }[])
         .map((r) => ({
           rowKey: `fb-${++fallbackKeyRef.current}`,
           childId: r.childId,
           name: r.name || '',
           alpn: r.alpn || '',
           path: r.path || '',
+          dest: r.dest || '',
           xver: r.xver || 0,
         })),
     );
@@ -385,6 +393,7 @@ export default function InboundFormModal({
         name: c.name,
         alpn: c.alpn,
         path: c.path,
+        dest: c.dest,
         xver: Number(c.xver) || 0,
         sortOrder: i,
       })),
@@ -437,6 +446,7 @@ export default function InboundFormModal({
       name: '',
       alpn: '',
       path: '',
+      dest: '',
       xver: 0,
     }]);
   };
@@ -445,11 +455,11 @@ export default function InboundFormModal({
     setFallbacks((prev) => prev.map((r) => {
       if (r.rowKey !== rowKey) return r;
       // When the picker selects a new child inbound and the row hasn't
-      // been hand-edited yet (sni/alpn/path all blank, xver = 0), pull
+      // been hand-edited yet (sni/alpn/path/dest all blank, xver = 0),
-      // the SNI/ALPN/Path defaults off that child. Operators who
+      // pull the SNI/ALPN/Path defaults off that child. Operators who
       // intentionally typed values keep them — we only fill the empties.
       if (typeof patch.childId === 'number' && patch.childId !== r.childId) {
-        const isPristine = !r.name && !r.alpn && !r.path && r.xver === 0;
+        const isPristine = !r.name && !r.alpn && !r.path && !r.dest && r.xver === 0;
         if (isPristine) return { ...r, ...patch, ...deriveFallbackDefaults(patch.childId) };
       }
       return { ...r, ...patch };
@@ -490,6 +500,7 @@ export default function InboundFormModal({
             name: derived.name ?? '',
             alpn: derived.alpn ?? '',
             path: derived.path ?? '',
+            dest: '',
             xver: derived.xver ?? 0,
           };
         });
@@ -1079,6 +1090,12 @@ export default function InboundFormModal({
               value={record.path}
               onChange={(e) => updateFallback(record.rowKey, { path: e.target.value })}
             />
+            <InputAddon>Dest</InputAddon>
+            <Input
+              placeholder={t('pages.inbounds.fallbacks.destPlaceholder') || 'auto'}
+              value={record.dest}
+              onChange={(e) => updateFallback(record.rowKey, { dest: e.target.value })}
+            />
             <InputAddon>xver</InputAddon>
             <InputNumber
               min={0}

frontend/src/schemas/forms/inbound-form.ts

@@ -78,6 +78,7 @@ export const FallbackRowSchema = z.object({
   name: z.string().default(''),
   alpn: z.string().default(''),
   path: z.string().default(''),
+  dest: z.string().default(''),
   xver: z.number().int().min(0).max(2).default(0),
 });
 export type FallbackRow = z.infer<typeof FallbackRowSchema>;

web/service/fallback.go

@@ -18,6 +18,7 @@ type FallbackInput struct {
 	Name      string `json:"name"`
 	Alpn      string `json:"alpn"`
 	Path      string `json:"path"`
+	Dest      string `json:"dest"`
 	Xver      int    `json:"xver"`
 	SortOrder int    `json:"sortOrder"`
 }
@@ -71,6 +72,7 @@ func (s *FallbackService) SetByMaster(masterId int, items []FallbackInput) error
 				Name:      c.Name,
 				Alpn:      c.Alpn,
 				Path:      c.Path,
+				Dest:      c.Dest,
 				Xver:      c.Xver,
 				SortOrder: c.SortOrder,
 			}
@@ -85,9 +87,6 @@ func (s *FallbackService) SetByMaster(masterId int, items []FallbackInput) error
 	})
 }
 
-// BuildFallbacksJSON resolves the master's fallback rows into Xray's
-// expected settings.fallbacks shape, looking up each child's listen+port
-// to fill the dest field. Returns nil when the master has no rules.
 func (s *FallbackService) BuildFallbacksJSON(tx *gorm.DB, masterId int) ([]map[string]any, error) {
 	if tx == nil {
 		tx = database.GetDB()
@@ -122,12 +121,16 @@ func (s *FallbackService) BuildFallbacksJSON(tx *gorm.DB, masterId int) ([]map[s
 		if !ok {
 			continue
 		}
+		dest := r.Dest
+		if dest == "" {
 			listen := strings.TrimSpace(child.Listen)
 			if listen == "" || listen == "0.0.0.0" || listen == "::" || listen == "::0" {
 				listen = "127.0.0.1"
 			}
+			dest = fmt.Sprintf("%s:%d", listen, child.Port)
+		}
 		entry := map[string]any{
-			"dest": fmt.Sprintf("%s:%d", listen, child.Port),
+			"dest": dest,
 		}
 		if r.Name != "" {
 			entry["name"] = r.Name

web/service/xray.go

@@ -304,7 +304,6 @@ func resolveXrayLogPaths(logCfg json_util.RawMessage) json_util.RawMessage {
 	return out
 }
 
-
 // GetXrayTraffic fetches the current traffic statistics from the running Xray process.
 func (s *XrayService) GetXrayTraffic() ([]*xray.Traffic, []*xray.ClientTraffic, error) {
 	if !s.IsXrayRunning() {

web/translation/ar-EG.json

@@ -266,6 +266,7 @@
         "add": "إضافة fallback",
         "pickInbound": "اختر inbound",
         "matchAny": "أي",
+        "destPlaceholder": "تلقائي (listen:port للفرع)",
         "rederive": "إعادة الملء من الفرع",
         "rederived": "تم إعادة الملء من الفرع",
         "editAdvanced": "تحرير حقول التوجيه",

web/translation/en-US.json

@@ -266,6 +266,7 @@
         "add": "Add fallback",
         "pickInbound": "Pick an inbound",
         "matchAny": "any",
+        "destPlaceholder": "auto (child listen:port)",
         "rederive": "Re-fill from child",
         "rederived": "Re-filled from child",
         "editAdvanced": "Edit routing fields",

web/translation/es-ES.json

@@ -266,6 +266,7 @@
         "add": "Añadir fallback",
         "pickInbound": "Selecciona un inbound",
         "matchAny": "cualquiera",
+        "destPlaceholder": "automático (listen:puerto del hijo)",
         "rederive": "Rellenar desde el hijo",
         "rederived": "Rellenado desde el hijo",
         "editAdvanced": "Editar campos de enrutamiento",

web/translation/fa-IR.json

@@ -266,6 +266,7 @@
         "add": "افزودن فال‌بک",
         "pickInbound": "یک اینباند انتخاب کنید",
         "matchAny": "همه",
+        "destPlaceholder": "خودکار (listen:port فرزند)",
         "rederive": "پر کردن مجدد از فرزند",
         "rederived": "از فرزند پر شد",
         "editAdvanced": "ویرایش فیلدهای مسیریابی",

web/translation/id-ID.json

@@ -266,6 +266,7 @@
         "add": "Tambah fallback",
         "pickInbound": "Pilih inbound",
         "matchAny": "apa pun",
+        "destPlaceholder": "otomatis (listen:port child)",
         "rederive": "Isi ulang dari child",
         "rederived": "Diisi ulang dari child",
         "editAdvanced": "Edit field routing",

web/translation/ja-JP.json

@@ -266,6 +266,7 @@
         "add": "フォールバックを追加",
         "pickInbound": "インバウンドを選択",
         "matchAny": "任意",
+        "destPlaceholder": "自動（子の listen:port）",
         "rederive": "子から再取得",
         "rederived": "子から再取得しました",
         "editAdvanced": "ルーティング項目を編集",

web/translation/pt-BR.json

@@ -266,6 +266,7 @@
         "add": "Adicionar fallback",
         "pickInbound": "Escolha um inbound",
         "matchAny": "qualquer",
+        "destPlaceholder": "automático (listen:porta do filho)",
         "rederive": "Preencher a partir do filho",
         "rederived": "Preenchido a partir do filho",
         "editAdvanced": "Editar campos de roteamento",

web/translation/ru-RU.json

@@ -266,6 +266,7 @@
         "add": "Добавить фолбэк",
         "pickInbound": "Выберите инбаунд",
         "matchAny": "любой",
+        "destPlaceholder": "авто (listen:порт дочернего)",
         "rederive": "Заполнить из дочернего",
         "rederived": "Заполнено из дочернего",
         "editAdvanced": "Изменить поля маршрутизации",

web/translation/tr-TR.json

@@ -266,6 +266,7 @@
         "add": "Fallback ekle",
         "pickInbound": "Bir inbound seç",
         "matchAny": "herhangi",
+        "destPlaceholder": "otomatik (child listen:port)",
         "rederive": "Child'dan yeniden doldur",
         "rederived": "Child'dan yeniden dolduruldu",
         "editAdvanced": "Yönlendirme alanlarını düzenle",

web/translation/uk-UA.json

@@ -266,6 +266,7 @@
         "add": "Додати фолбек",
         "pickInbound": "Оберіть інбаунд",
         "matchAny": "будь-який",
+        "destPlaceholder": "авто (listen:порт дочірнього)",
         "rederive": "Заповнити з дочірнього",
         "rederived": "Заповнено з дочірнього",
         "editAdvanced": "Редагувати поля маршрутизації",

web/translation/vi-VN.json

@@ -266,6 +266,7 @@
         "add": "Thêm fallback",
         "pickInbound": "Chọn một inbound",
         "matchAny": "bất kỳ",
+        "destPlaceholder": "tự động (listen:port của child)",
         "rederive": "Điền lại từ child",
         "rederived": "Đã điền lại từ child",
         "editAdvanced": "Sửa trường định tuyến",

web/translation/zh-CN.json

@@ -266,6 +266,7 @@
         "add": "添加回落",
         "pickInbound": "选择一个入站",
         "matchAny": "任意",
+        "destPlaceholder": "自动（子入站 listen:port）",
         "rederive": "从子入站重新填充",
         "rederived": "已从子入站重新填充",
         "editAdvanced": "编辑路由字段",

web/translation/zh-TW.json

@@ -266,6 +266,7 @@
         "add": "新增回落",
         "pickInbound": "選擇一個入站",
         "matchAny": "任何",
+        "destPlaceholder": "自動（子入站 listen:port）",
         "rederive": "從子入站重新填入",
         "rederived": "已從子入站重新填入",
         "editAdvanced": "編輯路由欄位",