Add python-dotenv support for automatic .env loading

- Added python-dotenv to requirements.txt
- Config now automatically loads .env file if present
- Allows local development without manually exporting env vars
- Gracefully falls back if python-dotenv not installed

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

config.py

@@ -16,6 +16,15 @@ from dataclasses import dataclass
 from pathlib import Path
 from typing import Optional
 
+# Load .env file if it exists
+try:
+    from dotenv import load_dotenv
+    _env_path = Path(__file__).parent / ".env"
+    if _env_path.exists():
+        load_dotenv(_env_path)
+except ImportError:
+    pass  # python-dotenv not installed
+
 
 @dataclass(frozen=True)
 class ElasticSettings:

requirements.txt

@@ -2,3 +2,4 @@ Flask>=2.3
 elasticsearch>=7.0.0,<9.0.0
 youtube-transcript-api>=0.6
 google-api-python-client>=2.0.0
+python-dotenv>=0.19.0