feat(v2.1.0): API publique + Webhooks sortants + PWA

- Public API: /api/v1 (collections, pages, my-tasks) with token auth
- Token generation: POST /api/v1/token
- Outbound webhooks: /workspace/webhooks CRUD + fire_event dispatcher
- PWA: manifest.json endpoint
- CSRF exempt for /api/v1
- 73/73 tests passent (+6 tests v2.1)
- Version 2.0.0 → 2.1.0
- Docs: ROADMAP updated — 7/7 blocs, 52/52 features ✅

app/routers/api.py

@@ -57,7 +57,7 @@ async def health():
 
     return {
         "status": "ok" if (db_ok and gitea_ok) else "degraded",
-        "version": "2.0.0",
+        "version": "2.1.0",
         "db": db_ok,
         "gitea": gitea_ok,
     }