Simplify code

gen_photo_alt_text/config.py

@@ -3,7 +3,6 @@
 from __future__ import annotations
 
 import os
-from pathlib import Path
 from typing import Dict
 
 from dotenv import load_dotenv
@@ -15,32 +14,6 @@ class ConfigError(RuntimeError):
     """Raised when critical configuration is missing."""
 
 
-LEGACY_KEY_MAP = {
-    "immich": "IMMICH_API_KEY",
-    "openai": "OPENAI_API_KEY",
-}
-
-
-def _load_legacy_api_keys(path: Path) -> Dict[str, str]:
-    """Parse the legacy ``api_keys`` file if it exists."""
-
-    if not path.exists():
-        return {}
-
-    values: Dict[str, str] = {}
-    for line in path.read_text().splitlines():
-        line = line.strip()
-        if not line or line.startswith("#"):
-            continue
-        if "=" not in line:
-            continue
-        key, value = [piece.strip() for piece in line.split("=", 1)]
-        mapped_key = LEGACY_KEY_MAP.get(key.lower())
-        if mapped_key and value:
-            values[mapped_key] = value
-    return values
-
-
 def load_settings() -> Dict[str, str]:
     """Load configuration from environment variables and ``api_keys``."""
 
@@ -62,11 +35,6 @@ def load_settings() -> Dict[str, str]:
         "MASTODON_CLIENT_SECRET": os.getenv("MASTODON_CLIENT_SECRET", ""),
     }
 
-    legacy_values = _load_legacy_api_keys(Path("api_keys"))
-    for key, value in legacy_values.items():
-        if not settings.get(key):
-            settings[key] = value
-
     missing = [
         key for key in ("IMMICH_API_KEY", "OPENAI_API_KEY") if not settings.get(key)
     ]