fix: Router generation and add file watching for extension changes

**Router Generation Fixes:**
- Fix router.js parsing (was looking for non-existent router.map.js)
- Parse Router.map(function() {...}) structure correctly
- Fix console route detection (check for path: '/' config)
- Fix function expression location (3rd arg after path config)
- Fix root extensions to use this.mount() not router.mount()

**File Watching:**
- Add chokidar to watch extension.js files in development
- Regenerate shims and loaders when extension.js changes
- Cache discovered extensions for regeneration
- Only watch in development mode

**Issues Fixed:**
1. Router.js now properly contains engine mounts
2. Extension.js changes trigger automatic regeneration

console/package.json

@@ -79,6 +79,7 @@
         "broccoli-file-creator": "^2.1.1",
         "broccoli-funnel": "^3.0.8",
         "broccoli-merge-trees": "^4.2.0",
+        "chokidar": "^5.0.0",
         "concurrently": "^8.2.2",
         "date-fns": "^2.30.0",
         "dragula": "^3.7.3",