Dodaj react-router-dom, mape tras i ProtectedRoute

Fundament migracji z useState(view) na prawdziwy routing:
- react-router-dom 7 w zaleznosciach
- BrowserRouter w main.tsx (nginx ma juz try_files, wiec czyste sciezki dzialaja)
- routes.ts: centralna mapa adresow + helpery listingPath/mapPath/adminTabPath
- ProtectedRoute z obsluga stanu loading z AuthProvider

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

frontend/package.json

@@ -12,7 +12,8 @@
     "@types/pdfmake": "^0.3.3",
     "pdfmake": "^0.3.11",
     "react": "18.3.1",
-    "react-dom": "18.3.1"
+    "react-dom": "18.3.1",
+    "react-router-dom": "^7.18.1"
   },
   "devDependencies": {
     "@types/react": "18.3.12",