[QA] ✅ VERIFIED **Test Results:** - All 41 tests passing (12 new config tests) - Code quality: ruff check & format passing - Manual testing: All requirements verified **Verified functionality:** 1. ✅ Settings class with all required fields (DATABASE_PATH, JWT_SECRET_KEY, API_KEY_SALT, LOG_LEVEL) 2. ✅ Environment variable loading 3. ✅ .env file loading 4. ✅ Correct precedence (env vars > .env file > defaults) 5. ✅ Auto-generation of secure secrets (JWT_SECRET_KEY, API_KEY_SALT) 6. ✅ Settings caching via get_settings() 7. ✅ LOG_LEVEL validation 8. ✅ Case-sensitive env vars 9. ✅ Extra env vars ignored **Security:** - Secrets use cryptographically secure generation (secrets.token_urlsafe) - No vulnerabilities identified Full QA report: /tmp/qa-CDEV-4.md

Implemented configuration management with pydantic-settings: **Changes made:** - Added `pydantic-settings>=2.0.0` to dependencies in `pyproject.toml:16` - Created `app/config.py` with `Settings` class supporting: - `DATABASE_PATH`: SQLite database path (default: `/data/cdev.db`) - `JWT_SECRET_KEY`: Auto-generated secure key for JWT signing - `API_KEY_SALT`: Auto-generated salt for API key hashing - `LOG_LEVEL`: Validated log level (DEBUG/INFO/WARNING/ERROR/CRITICAL, default: INFO) - Settings load from .env file and environment variables (env vars take precedence) - Security settings auto-generate secure defaults if not provided - Implemented `get_settings()` with caching via `@lru_cache` - Created comprehensive tests in `tests/test_config.py` (12 tests) **Verification:** - All 41 tests pass (`pytest -v`) - Code passes `ruff check` and `ruff format --check`