feat(01-01): add Pydantic Settings class to config.py and update requirements.txt
- Add Settings(BaseSettings) class reading DATABASE_URL, DATABASE_MIGRATE_URL,
MINIO_ENDPOINT, MINIO_ACCESS_KEY, MINIO_SECRET_KEY, MINIO_BUCKET, REDIS_URL,
SECRET_KEY from environment via SettingsConfigDict (pydantic-settings v2 API)
- Instantiate settings = Settings() at module level for all callers
- Preserve legacy DATA_DIR, UPLOADS_DIR, METADATA_DIR, TOPICS_FILE, SETTINGS_FILE,
DEFAULT_SYSTEM_PROMPT, DEFAULT_SETTINGS, ensure_data_dirs() for Wave 4 compat
- Remove filelock>=3.14 (replaced by PostgreSQL transactions per STORE-07)
- Add sqlalchemy[asyncio]>=2.0.49, psycopg[binary]>=3.3.4, alembic>=1.18.4,
minio>=7.2.20, celery[redis]>=5.6.3, redis>=7.4.0, aiosqlite>=0.20.0
- Bump pytest-asyncio to >=1.3.0 for asyncio_mode auto support
curo1305
6c507d5991