docs: update tasktracking for node management tasks 3-5

docs/Tasktracking/2026-04-24-node-management-sidebar.md

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+# Tasktracking: Node Management Sidebar
+
+**Date:** 2026-04-24
+**Branch:** fix
+**Status:** In Progress
+
+## Overview
+
+Adding a Node Management sidebar page to the 3x-ui web panel for cluster node visibility.
+
+## Tasks
+
+| # | Task | Status | Commit |
+|---|------|--------|--------|
+| 1 | Add `GetNodeStates` database query | DONE | 85c6b661 |
+| 2 | Create `NodeController` with API endpoints | DONE | 16eb179e |
+| 3 | Register `NodeController` routes in server | DONE | — |
+| 4 | Add i18n translations for node page | DONE | fc77154c |
+| 5 | Add sidebar menu item | DONE | c09c6182 |
+| 6 | Create `nodes.html` template page | PENDING | — |
+| 7 | Build and verify | PENDING | — |
+
+## Task 2 Details
+
+**File created:** `web/controller/node.go`
+
+**Endpoints:**
+- `GET /node/list` — returns connected nodes with online/offline status based on heartbeat threshold
+- `GET /node/config` — returns current node role, ID, sync intervals, and DB connection settings
+- `POST /node/config` — validates and persists node + DB settings to `x-ui.json`
+
+**Bug fixes applied from spec:**
+1. Added missing `"time"` import (used by `time.Now().Unix()`)
+2. Added missing `"os"` import (used by `os.ErrInvalid`)
+3. Removed unused `"net/http"` import
+4. Removed unused `"model"` import (return type of `database.GetNodeStates()` is inferred)