feat(api-docs): add JSON syntax highlighting and top-right copy button to code blocks

frontend/src/pages/api-docs/ApiDocsPage.vue

@@ -18,6 +18,7 @@ import AppSidebar from '@/components/AppSidebar.vue';
 import { HttpUtil, ClipboardManager } from '@/utils/index.js';
 import { sections as allSections } from './endpoints.js';
 import EndpointSection from './EndpointSection.vue';
+import CodeBlock from './CodeBlock.vue';
 
 const { t } = useI18n();
 
@@ -182,7 +183,7 @@ onMounted(() => {
             </a-card>
 
             <a-card class="curl-card" size="small" title="Quick example">
-              <pre class="code-block">{{ curlExample }}</pre>
+              <CodeBlock :code="curlExample" lang="text" />
             </a-card>
 
             <div class="toolbar">

frontend/src/pages/api-docs/CodeBlock.vue

@@ -0,0 +1,152 @@
+<script setup>
+import { computed, ref } from 'vue';
+import { message } from 'ant-design-vue';
+import { CopyOutlined, CheckOutlined } from '@ant-design/icons-vue';
+
+const props = defineProps({
+  code: { type: String, default: '' },
+  lang: { type: String, default: 'json' },
+});
+
+const copied = ref(false);
+
+function escapeHtml(str) {
+  return str.replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;');
+}
+
+function highlightJson(str) {
+  const escaped = escapeHtml(str);
+  return escaped.replace(
+    /("(?:[^"\\]|\\.)*")\s*(:)|("(?:[^"\\]|\\.)*")|(-?\d+\.?\d*(?:[eE][+-]?\d+)?)\b|(true|false)|(null)|([{}\[\]])/g,
+    (_m, key, colon, string, number, bool, nil) => {
+      if (colon) return `<span class="json-key">${key}</span>${colon}`;
+      if (string) return `<span class="json-string">${string}</span>`;
+      if (number) return `<span class="json-number">${number}</span>`;
+      if (bool) return `<span class="json-boolean">${bool}</span>`;
+      if (nil) return `<span class="json-null">${nil}</span>`;
+      return _m;
+    }
+  );
+}
+
+const highlighted = computed(() => {
+  if (props.lang === 'json') {
+    return highlightJson(props.code);
+  }
+  return escapeHtml(props.code);
+});
+
+async function copyCode() {
+  try {
+    await navigator.clipboard.writeText(props.code);
+    copied.value = true;
+    message.success('Copied');
+    setTimeout(() => { copied.value = false; }, 2000);
+  } catch {
+    message.error('Copy failed');
+  }
+}
+</script>
+
+<template>
+  <div class="code-block-wrapper">
+    <button class="copy-btn" :class="{ copied }" @click="copyCode" :title="copied ? 'Copied' : 'Copy'">
+      <CheckOutlined v-if="copied" />
+      <CopyOutlined v-else />
+    </button>
+    <pre class="code-block" :class="`lang-${lang}`"><code v-html="highlighted"></code></pre>
+  </div>
+</template>
+
+<style scoped>
+.code-block-wrapper {
+  position: relative;
+  border-radius: 6px;
+  overflow: hidden;
+}
+
+.copy-btn {
+  position: absolute;
+  top: 6px;
+  right: 6px;
+  z-index: 1;
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  width: 28px;
+  height: 28px;
+  border: 1px solid rgba(128, 128, 128, 0.2);
+  border-radius: 4px;
+  background: rgba(255, 255, 255, 0.85);
+  color: rgba(0, 0, 0, 0.5);
+  cursor: pointer;
+  font-size: 13px;
+  opacity: 0;
+  transition: opacity 0.15s, background 0.15s, color 0.15s;
+}
+
+.code-block-wrapper:hover .copy-btn {
+  opacity: 1;
+}
+
+.copy-btn:hover {
+  background: #fff;
+  color: #1677ff;
+  border-color: #1677ff;
+}
+
+.copy-btn.copied {
+  opacity: 1;
+  background: #52c41a;
+  color: #fff;
+  border-color: #52c41a;
+}
+
+.code-block {
+  background: rgba(128, 128, 128, 0.08);
+  border: 1px solid rgba(128, 128, 128, 0.15);
+  border-radius: 6px;
+  padding: 12px;
+  margin: 0;
+  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
+  font-size: 12.5px;
+  line-height: 1.55;
+  white-space: pre-wrap;
+  word-break: break-word;
+  overflow-x: auto;
+}
+
+
+</style>
+
+<style>
+.json-key { color: #0550ae; }
+.json-string { color: #0a3069; }
+.json-number { color: #0550ae; }
+.json-boolean { color: #cf222e; }
+.json-null { color: #8250df; }
+
+body.dark .code-block {
+  background: rgba(255, 255, 255, 0.04);
+  border-color: rgba(255, 255, 255, 0.1);
+  color: rgba(255, 255, 255, 0.88);
+}
+
+body.dark .json-key { color: #79c0ff; }
+body.dark .json-string { color: #a5d6ff; }
+body.dark .json-number { color: #79c0ff; }
+body.dark .json-boolean { color: #ff7b72; }
+body.dark .json-null { color: #d2a8ff; }
+
+body.dark .copy-btn {
+  background: rgba(255, 255, 255, 0.08);
+  color: rgba(255, 255, 255, 0.5);
+  border-color: rgba(255, 255, 255, 0.15);
+}
+
+body.dark .copy-btn:hover {
+  background: rgba(255, 255, 255, 0.12);
+  color: #58a6ff;
+  border-color: #58a6ff;
+}
+</style>

frontend/src/pages/api-docs/EndpointRow.vue

@@ -1,6 +1,7 @@
 <script setup>
 import { computed } from 'vue';
 import { methodColors } from './endpoints.js';
+import CodeBlock from './CodeBlock.vue';
 
 const props = defineProps({
   endpoint: { type: Object, required: true },
@@ -33,16 +34,12 @@ const paramColumns = [
 
     <div v-if="endpoint.body" class="endpoint-block">
       <div class="block-label">Request body</div>
-      <a-typography-paragraph :copyable="{ text: endpoint.body }">
-        <pre class="code-block">{{ endpoint.body }}</pre>
-      </a-typography-paragraph>
+      <CodeBlock :code="endpoint.body" lang="json" />
     </div>
 
     <div v-if="endpoint.response" class="endpoint-block">
       <div class="block-label">Response</div>
-      <a-typography-paragraph :copyable="{ text: endpoint.response }">
-        <pre class="code-block">{{ endpoint.response }}</pre>
-      </a-typography-paragraph>
+      <CodeBlock :code="endpoint.response" lang="json" />
     </div>
   </div>
 </template>