fix: ensure production uses DB-configured model/provider from UI

- Migration 026: update seed defaults from ollama to vllm/AxionML
- Migration 031: fix existing rows still on old ollama defaults
- Helm values: set OLLAMA_BASE_URL to cluster ollama endpoint (was empty)
- Extractor: guard against switching to ollama when base_url is empty
- OllamaClient: validate base_url on construction to fail fast

services/extractor/client.py

@@ -140,6 +140,11 @@ class OllamaClient:
         max_retries: int | None = None,
         http_client: httpx.AsyncClient | None = None,
     ) -> None:
+        if not config.base_url or not config.base_url.startswith(("http://", "https://")):
+            raise ValueError(
+                f"OllamaClient requires a valid base_url (got {config.base_url!r}). "
+                "Set OLLAMA_BASE_URL environment variable."
+            )
         self._config = config
         self._max_retries = max_retries if max_retries is not None else config.max_retries
         self._base_delay = config.retry_base_delay