fix: Unwrap CEIDG /firma/{id} response structure {"firma": [{...}]}

The detail endpoint wraps firm data in a lista under "firma" key.
Without unwrapping, the list of dicts was assigned to legal_name (String),
causing psycopg2 ProgrammingError: can't adapt type 'dict'.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

ceidg_api_service.py

@@ -30,12 +30,23 @@ CEIDG_TIMEOUT = 15  # seconds
 
 
 def _fetch_firma_detail(firma_id: str, headers: dict) -> Optional[Dict[str, Any]]:
-    """Phase 2: Fetch full company details from /firma/{id} endpoint."""
+    """Phase 2: Fetch full company details from /firma/{id} endpoint.
+
+    The API returns {"firma": [{...}]} — unwrap to get the actual firm dict.
+    """
     url = f"{CEIDG_API_BASE}/firma/{firma_id}"
     try:
         response = requests.get(url, headers=headers, timeout=CEIDG_TIMEOUT)
         if response.status_code == 200:
-            return response.json()
+            data = response.json()
+            # Unwrap: /firma/{id} returns {"firma": [{...company data...}]}
+            if isinstance(data, dict) and 'firma' in data:
+                firmy = data['firma']
+                if isinstance(firmy, list) and firmy:
+                    return firmy[0]
+                if isinstance(firmy, dict):
+                    return firmy
+            return data
         logger.warning(f"CEIDG detail endpoint returned {response.status_code} for id={firma_id}")
     except Exception as e:
         logger.warning(f"CEIDG detail fetch failed for id={firma_id}: {e}")