refactor(todo): rename Labels to Tags for consistency across apps

- Rename route /labels to /tags and /label/[id] to /tag/[id]
- Rename LabelSelector component to TagSelector
- Update all UI texts from "Labels" to "Tags"
- Update navigation items and references
- Align terminology with Calendar and Contacts apps

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

scripts/generate-env.mjs

@@ -422,6 +422,8 @@ const APP_CONFIGS = [
 		vars: {
 			PUBLIC_BACKEND_URL: (env) => `http://localhost:${env.CALENDAR_BACKEND_PORT || '3014'}`,
 			PUBLIC_MANA_CORE_AUTH_URL: (env) => env.MANA_CORE_AUTH_URL,
+			PUBLIC_TODO_BACKEND_URL: (env) =>
+				env.TODO_BACKEND_URL || `http://localhost:${env.TODO_BACKEND_PORT || '3018'}`,
 		},
 	},