Add Gemini API key file and update config to read from file

2_backend_llm/app/config.py

@@ -7,6 +7,7 @@ or a .env file (which is git-ignored for security).
 """
 
 import os
+from pathlib import Path
 from dataclasses import dataclass
 from dotenv import load_dotenv  # type: ignore
 
@@ -16,6 +17,21 @@ from dotenv import load_dotenv  # type: ignore
 load_dotenv(override=False)
 
 
+def _load_api_key_from_file(key_name: str) -> str | None:
+    """Load API key from file if environment variable is not set."""
+    # Try to find the key file in project root
+    project_root = Path(__file__).resolve().parent.parent.parent
+    key_file = project_root / f"{key_name.lower()}.txt"
+    
+    if key_file.exists():
+        try:
+            return key_file.read_text().strip()
+        except Exception:
+            pass
+    
+    return None
+
+
 @dataclass
 class Settings:
     """
@@ -25,8 +41,9 @@ class Settings:
     This provides flexibility for different deployment environments.
     """
     # LLM API keys - at least one must be set for the system to work
-    openai_api_key: str | None = os.getenv("OPENAI_API_KEY")
-    gemini_api_key: str | None = os.getenv("GEMINI_API_KEY")
+    # Try environment variable first, then fallback to file
+    openai_api_key: str | None = os.getenv("OPENAI_API_KEY") or _load_api_key_from_file("OPENAI_API_KEY")
+    gemini_api_key: str | None = os.getenv("GEMINI_API_KEY") or _load_api_key_from_file("GEMINI_API_KEY")
     
     # CSV data file path - relative to project root
     # Default to feedback_transformed_2.csv which has pre-calculated date/time fields

gemini_api_key.txt

@@ -0,0 +1,2 @@
+AIzaSyCO3OfHPsocMDDI2KfotavH5qFZMmrzy8w
+