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/middleware/csrf.py

@@ -16,7 +16,7 @@ class CSRFMiddleware(BaseHTTPMiddleware):
     """
 
     SAFE_METHODS = {"GET", "HEAD", "OPTIONS"}
-    EXCLUDED_PATHS = {"/api/webhook", "/auth/callback", "/board/api/pages", "/db/", "/workspace"}
+    EXCLUDED_PATHS = {"/api/webhook", "/api/v1", "/auth/callback", "/board/api/pages", "/db/", "/workspace"}
 
     async def dispatch(self, request: Request, call_next):
         # Webhook receiver, OAuth callback, and internal API are exempt