fix: chargement tree sidebar 100% client-side (pas de asyncio.run)

Avant: _sidebar_data() utilisait asyncio.run() → RuntimeWarning + 302 redirects
Après: gitea_workspace.html appelle loadSidebarTree() → fetch API → injecte dans #sidebar-workspace-items

- base.html: ajout id='sidebar-workspace-items' sur le <ul> workspace
- dashboard.py: _sidebar_data() ne fait plus de fetch serveur, juste passe owner/repo

app/routers/dashboard.py

@@ -72,37 +72,14 @@ def _sidebar_data(request: Request, repos: list[dict]) -> dict:
     gitea_workspace = False
 
     if ws_cookie and ws_cookie.startswith("gitea:"):
-        # Gitea workspace: fetch repo tree for sidebar
+        # Gitea workspace: set owner/repo for client-side tree loading
         parts = ws_cookie.split(":", 2)
         if len(parts) >= 3:
             gitea_owner = parts[1]
             gitea_repo = parts[2]
             active_ws_name = f"{gitea_owner}/{gitea_repo}"
             gitea_workspace = True
-            # Fetch root tree from Gitea API (use admin token as fallback)
-            try:
-                from app.services.gitea_client import get_user_gitea_client, GiteaClient
-                gitea = get_user_gitea_client(request) or GiteaClient()
-                import asyncio
-                tree_items = asyncio.run(gitea.get_repo_contents(gitea_owner, gitea_repo))
-                for item in tree_items:
-                    is_folder = item.get("type") == "dir"
-                    workspace_pages.append({
-                        "id": item.get("path", ""),
-                        "name": item.get("name", ""),
-                        "icon": "📁" if is_folder else "📄",
-                        "url": f"javascript:void(0)",
-                        "active": False,
-                        "indent": 0,
-                        "depth": 0,
-                        "has_children": is_folder,
-                        "children": [],
-                        "_gitea_path": item.get("path", ""),
-                        "_gitea_type": "folder" if is_folder else "file",
-                        "_gitea_sha": item.get("sha", ""),
-                    })
-            except Exception:
-                pass
+            workspace_pages = []  # loaded client-side
     elif ws_cookie:
         workspace_pages = _load_workspace_pages(ws_cookie)
         try: