fix(ops): avoid truncating stockplatform runtime readback

apps/api/src/services/stockplatform_public_api_runtime_readback.py

@@ -33,6 +33,7 @@ _DEFAULT_BASE_URL = "https://stock.wooo.work"
 _DEFAULT_TIMEOUT_SECONDS = 4.0
 _DEFAULT_DATA_ENDPOINT_TIMEOUT_SECONDS = 10.0
 _DEFAULT_PROBE_ATTEMPTS = 2
+_MAX_READBACK_BODY_BYTES = 500_000
 
 Probe = Callable[[str, float], dict[str, Any]]
 
@@ -650,10 +651,12 @@ def _http_probe(url: str, timeout_seconds: float) -> dict[str, Any]:
     )
     try:
         with urllib.request.urlopen(request, timeout=timeout_seconds) as response:
-            body = response.read(8192).decode("utf-8", "replace")
+            body = response.read(_MAX_READBACK_BODY_BYTES).decode(
+                "utf-8", "replace"
+            )
             return {"http_status": response.status, "body": body, "error": ""}
     except urllib.error.HTTPError as exc:
-        body = exc.read(2048).decode("utf-8", "replace")
+        body = exc.read(_MAX_READBACK_BODY_BYTES).decode("utf-8", "replace")
         return {"http_status": exc.code, "body": body, "error": ""}
     except Exception as exc:  # noqa: BLE001 - readback must fail closed.
         return {"http_status": None, "body": "", "error": _error_text(exc)}