API: add /api/health (public) and /api/ping (auth) for diagnostics

app.py

@@ -266,6 +266,16 @@ def list_attributes(_: None = Depends(_require_auth)):
     return JSONResponse(items)
 
 
+@api.get("/api/health")
+def health():
+    return {"status": "ok"}
+
+
+@api.get("/api/ping")
+def ping(_: None = Depends(_require_auth)):
+    return {"status": "ok", "auth": True}
+
+
 @api.post("/api/edit")
 async def api_edit(
     file: UploadFile = File(...),