feat(projets): épinglés par étoiles Gitea (#20)

list_starred/set_starred sur /user/starred (vérité dans la
forge), endpoint POST /api/projects/{o}/{r}/star (CSRF), section
Épinglés hors onglets, bouton étoile sur les cartes et bascule
sans rechargement; les épinglés sortent de leur grille d'onglet.

app/gitea_client.py

@@ -317,6 +317,26 @@ class GiteaClient:
         self._cache_put(key, milestones)
         return milestones
 
+    async def list_starred(self) -> list[dict]:
+        """Repos starred by the token user (issue #20: pinning rides
+        on Gitea stars — the forge stays the source of truth)."""
+        key = "user:starred"
+        cached = self._cache_get(key)
+        if cached is not None:
+            return cached
+        repos = await self._get_all_pages("/user/starred")
+        self._cache_put(key, repos)
+        return repos
+
+    async def set_starred(self, owner: str, repo: str, starred: bool) -> None:
+        """Star / unstar a repo for the token user."""
+        if starred:
+            r = await self.client.put(f"/user/starred/{owner}/{repo}")
+        else:
+            r = await self.client.delete(f"/user/starred/{owner}/{repo}")
+        r.raise_for_status()
+        self._cache_clear()
+
     async def create_issue(
         self, owner: str, repo: str, title: str, body: str = ""
     ) -> dict: