feat(URL协议): 增强URL协议注册健壮性

- 新增check_url_protocol_status命令检测注册状态
- 新增unregister_url_protocol命令取消注册
- 改进register_url_protocol命令增加验证逻辑
- 前端增加状态检测、自动重试和操作日志功能
- 更新多语言翻译支持新功能

src/i18n/locales/en-US.json

@@ -128,7 +128,7 @@
       "appearance": "Appearance",
       "security": "Security",
       "account": "Account",
-      "database": "Database Connection",
+      "database": "Cloud Sync",
       "dataManagement": "Data Management",
       "urlProtocol": "URL Protocol",
       "about": "About"
@@ -255,6 +255,45 @@
       "uploadSuccess": "Local data uploaded to remote",
       "uploadFailed": "Upload failed"
     },
+    "cloudSync": {
+      "title": "Cloud Sync",
+      "selectMethod": "Select Sync Method",
+      "selectMethodHint": "Choose a data sync method. The two methods are mutually exclusive. Switching will use the new sync channel.",
+      "postgresql": "Self-hosted PostgreSQL",
+      "postgresqlDesc": "Connect to your own PostgreSQL database for full data control. Ideal for users with their own server.",
+      "sectlCloud": "SECTL Cloud Sync",
+      "sectlCloudDesc": "Sync data via SECTL cloud platform. No self-hosted database needed, works out of the box.",
+      "loginRequired": "Please log in to SECTL Auth first",
+      "loginHint": "SECTL Cloud Sync requires a SECTL Auth account. Please go to the 'Account' tab to log in.",
+      "statusTitle": "Sync Status",
+      "configured": "Ready",
+      "notConfigured": "Not Ready",
+      "syncing": "Syncing...",
+      "lastSync": "Last synced",
+      "never": "Never synced",
+      "syncActions": "Sync Actions",
+      "syncDirection": "Sync Direction",
+      "bidirectional": "Bidirectional (Recommended) — Automatically merge local and cloud data",
+      "pushOnly": "Upload only — Overwrite cloud data with local data",
+      "pullOnly": "Download only — Overwrite local data with cloud data",
+      "startSync": "Start Sync",
+      "uploadToCloud": "Upload to Cloud",
+      "downloadFromCloud": "Download from Cloud",
+      "fullSync": "Bidirectional Sync",
+      "syncInProgress": "Sync is in progress, please wait",
+      "syncConfirm": "Confirm {{direction}}?",
+      "storageUsage": "Storage Usage",
+      "usedStorage": "Used",
+      "table": "Table",
+      "records": "Records",
+      "size": "Size",
+      "clickToLoadStats": "Click refresh to load stats",
+      "description": "SECTL Cloud Sync Guide",
+      "descriptionPoint1": "Sync data via SECTL cloud service. No self-hosted database needed. Data is isolated by SECTL Auth account.",
+      "descriptionPoint2": "Based on KV storage architecture. Each data table is stored as a key-value pair for efficient read/write.",
+      "descriptionPoint3": "Supports bidirectional, upload-only, and download-only modes for different scenarios.",
+      "descriptionPoint4": "Data is transmitted over HTTPS with OAuth 2.0 authentication for security."
+    },
     "data": {
       "title": "Data Management",
       "settlement": "Settlement",
@@ -301,7 +340,39 @@
       "register": "Register URL Protocol",
       "registered": "URL protocol registered",
       "registerFailed": "Registration failed",
-      "installerRequired": "Requires installed SecScore, may not work in development mode."
+      "installerRequired": "Requires installed SecScore, may not work in development mode.",
+      "checkStatus": "Check Status",
+      "reRegister": "Re-register",
+      "unregister": "Unregister",
+      "unregistered": "URL protocol unregistered",
+      "unregisterFailed": "Failed to unregister",
+      "statusRegistered": "Registered",
+      "statusNotRegistered": "Not Registered",
+      "statusCheckFailed": "Status check failed",
+      "retrying": "Retrying ({{current}}/{{max}})",
+      "retryFailed": "Max retries reached, registration failed",
+      "retrySuccess": "Retry #{{n}} succeeded",
+      "operationLog": "Operation Log",
+      "logRegisterStart": "Starting URL protocol registration...",
+      "logRegisterVerify": "Registration command executed, verifying...",
+      "logRegisterSuccess": "Registration verified successfully",
+      "logRegisterFailed": "Registration verification failed",
+      "logUnregisterStart": "Unregistering...",
+      "logUnregisterSuccess": "Unregistered successfully",
+      "logUnregisterFailed": "Unregister failed",
+      "logMaxRetries": "Max retries (7) reached"
+    },
+    "elevation": {
+      "title": "Administrator Privileges",
+      "description": "Check if the application is running with administrator/root privileges. Some features (like port listening, system-level operations) require elevated privileges.",
+      "elevated": "Elevated",
+      "notElevated": "Not Elevated",
+      "request": "Request Admin Privileges",
+      "requestSuccess": "Admin privileges requested, application will restart",
+      "requestFailed": "Failed to request admin privileges",
+      "windowsHint": "Windows: A UAC prompt will appear. After confirmation, the app will restart as administrator.",
+      "macosHint": "macOS: A system authentication dialog will appear. Enter admin password to restart the app.",
+      "linuxHint": "Linux: Uses pkexec to request root privileges. Enter password to restart the app."
     },
     "mcp": {
       "title": "MCP Service",