feat(v4.0): Settings/Integrations — Gitea + GitHub connect/disconnect matrix

- GitHub integration row ajoutée (🦎 Gitea + 🐙 GitHub)
- Badge 'Primary' sur le provider principal (auth_method)
- Disconnect masqué pour le provider principal
- authMethod, githubLinked, giteaLinked dans Alpine data
- loadGithubStatus() + disconnectGithub() methods
- Matrice respectée: local→déco OK, gitea→déco github OK, github→déco gitea OK

app/routers/dashboard.py

@@ -90,6 +90,27 @@ def _sidebar_data(request: Request, repos: list[dict]) -> dict:
         except (ValueError, Exception):
             pass
 
+    # Auth method & OAuth badge data
+    auth_method = "local"
+    gitea_linked = False
+    github_linked = False
+    if user and user.get("id"):
+        try:
+            with get_conn() as conn:
+                am_row = conn.execute("SELECT auth_method FROM users WHERE id=?", (user["id"],)).fetchone()
+                if am_row and am_row["auth_method"]:
+                    auth_method = am_row["auth_method"]
+                tokens = conn.execute(
+                    "SELECT provider FROM user_oauth_tokens WHERE user_id=?", (user["id"],)
+                ).fetchall()
+                for t in tokens:
+                    if t["provider"] == "gitea":
+                        gitea_linked = True
+                    elif t["provider"] == "github":
+                        github_linked = True
+        except Exception:
+            pass
+
     return {
         "workspace_name": ws, "workspace_initial": initial,
         "active_ws_name": active_ws_name,
@@ -104,6 +125,9 @@ def _sidebar_data(request: Request, repos: list[dict]) -> dict:
         "avatar_url": avatar_url,
         "avatar_color": avatar_color,
         "workspace_key": "",
+        "auth_method": auth_method,
+        "gitea_linked": gitea_linked,
+        "github_linked": github_linked,
     }