feat: API key management improvements

- Rename routes: /dashboard/tokens → /dashboard/apikeys, /dashboard/manager/keys → /dashboard/manager/channels
- Add KeyPlain field to store plaintext API keys for re-viewing
- API key list shows masked key (sk-ot-123456****abcd) with eye toggle to reveal
- Copy button with 2s feedback on key list
- TokenNew shows full key + copy after creation
- Increase key prefix display to 12 characters
- Fix SQLite driver: replace gorm.io/driver/sqlite with ncruces/go-sqlite3/gormlite
- Fix user.status === 'active' checks across frontend views
- Add channel store for new channels API
- Update Makefile frontend build to work reliably

BREAKING CHANGE: Existing API keys created before this change will not show their plaintext value (only prefix visible).

backend/router/setRouter.go

@@ -80,16 +80,24 @@ func SetRouter(cfg *config.Config, db *gorm.DB, web *embed.FS) {
 		// User profile
 		apiGroup.GET("/me", apiHandler.Me)
 		apiGroup.GET("/profile", apiHandler.Me)
+		apiGroup.POST("/profile/update", apiHandler.UpdateProfile)
+		apiGroup.POST("/profile/update/password", apiHandler.UpdatePassword)
 
 		// User management (admin)
 		apiGroup.GET("/users", apiHandler.ListUsers)
+		apiGroup.GET("/users/:id", apiHandler.GetUser)
 		apiGroup.POST("/users", apiHandler.CreateUser)
+		apiGroup.PUT("/users/:id", apiHandler.UpdateUser)
 		apiGroup.DELETE("/users/:id", apiHandler.DeleteUser)
+		apiGroup.POST("/users/batch/:option", apiHandler.BatchUsers)
 
 		// API Key management
 		apiGroup.GET("/keys", apiHandler.ListApiKeys)
+		apiGroup.GET("/keys/:id", apiHandler.GetApiKey)
 		apiGroup.POST("/keys", apiHandler.CreateApiKey)
+		apiGroup.PUT("/keys/:id", apiHandler.UpdateApiKey)
 		apiGroup.DELETE("/keys/:id", apiHandler.DeleteApiKey)
+		apiGroup.POST("/keys/batch/:option", apiHandler.BatchApiKeys)
 
 		// Channel management
 		apiGroup.GET("/channels", apiHandler.ListChannels)