fix(config): Correct API key filename and improve logging

- Changes the expected API key filename from 'api_key.txt' to 'gemini_api_key.txt' to match the project standard.
- Enhances logging to output the absolute path when an API key file is not found, simplifying future debugging.

config.py

@@ -21,7 +21,7 @@ import logging
 BASE_DIR = os.path.dirname(os.path.abspath(__file__))
 
 CREDENTIALS_FILE = os.path.join(BASE_DIR, "service_account.json")
-API_KEY_FILE = os.path.join(BASE_DIR, "api_key.txt")        # OpenAI
+API_KEY_FILE = os.path.join(BASE_DIR, "gemini_api_key.txt") # Standard für Gemini
 SERP_API_KEY_FILE = os.path.join(BASE_DIR, "serpApiKey.txt")
 GENDERIZE_API_KEY_FILE = os.path.join(BASE_DIR, "genderize_API_Key.txt")
 BRANCH_MAPPING_FILE = None
@@ -509,19 +509,20 @@ class Config:
     def _load_key_from_file(filepath):
         """Hilfsfunktion zum Laden eines Schluessels aus einer Datei."""
         logger = logging.getLogger(__name__)
+        abs_path = os.path.abspath(filepath)
         try:
-            with open(filepath, "r", encoding="utf-8") as f:
+            with open(abs_path, "r", encoding="utf-8") as f:
                 key = f.read().strip()
                 if key:
                     return key
                 else:
-                    logger.warning(f"Datei '{filepath}' ist leer.")
+                    logger.warning(f"API key file is empty: '{abs_path}'")
                     return None
         except FileNotFoundError:
-            logger.info(f"API-Schluesseldatei '{filepath}' nicht gefunden.")
+            logger.warning(f"API key file not found at path: '{abs_path}'")
             return None
         except Exception as e:
-            logger.error(f"FEHLER beim Lesen der Schluesseldatei '{filepath}': {e}")
+            logger.error(f"Error reading key file '{abs_path}': {e}")
             return None
 
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