chore: commit remaining pre-existing changes

- Agent configs (.opencode/agents/)
- Backend: alembic, routes, app, utils, scripts
- Frontend: package.json, vite, components, e2e infra
- Specs: 028-llm-datasource-supeset updates
- Docker e2e config and Playwright setup

backend/src/api/routes/settings.py

@@ -48,13 +48,18 @@ router = APIRouter()
 
 # #region _normalize_superset_env_url [C:1] [TYPE Function]
 # @BRIEF Canonicalize Superset environment URL to base host/path without trailing /api/v1.
+#   Auto-prepends https:// if no scheme is present.
 # @PRE: raw_url can be empty.
-# @POST: Returns normalized base URL.
+# @POST: Returns normalized base URL with scheme.
 def _normalize_superset_env_url(raw_url: str) -> str:
     normalized = str(raw_url or "").strip().rstrip("/")
     if normalized.lower().endswith("/api/v1"):
         normalized = normalized[: -len("/api/v1")]
-    return normalized.rstrip("/")
+    normalized = normalized.rstrip("/")
+    # Auto-prepend https:// if no scheme is present
+    if normalized and not normalized.startswith("http://") and not normalized.startswith("https://"):
+        normalized = f"https://{normalized}"
+    return normalized
 
 
 # #endregion _normalize_superset_env_url