Stop leaking internal exception messages to client in MeiliSearchView.getuid

[t0kubetsu]

Summary

Fixes #91

The /meili/getuid endpoint returned str(e) directly to authenticated users, which could expose Meilisearch internal error details, server host/port, or query structure.

Change

# Before
except Exception as e:
    return jsonify({"error": str(e)}), 404

# After
except Exception:
    logger.exception("Error fetching Meilisearch document uid=%s", uid)
    return jsonify({"error": "Document not found"}), 404

Test plan

• Request a non-existent document UID and verify the response body is {"error": "Document not found"}
• Verify the server log contains the full exception details