fix: deployment — resolve dependency conflicts, add initial migration, CI/CD webhook

- Fix httpx/pydantic/redis version conflicts for litellm/aiogram/celery compatibility
- Add PYTHONPATH=/app to Dockerfile for alembic module resolution
- Skip Telegram webhook setup when URL is not HTTPS
- Fix FileUpload prop type mismatch in RecordingsPage
- Add alembic script.py.mako template and initial migration
- Configure docker-compose: port 8081, built frontend, no exposed internal ports
- Add deploy.sh and webhook-server.js for Gitea CI/CD auto-deploy

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

backend/Dockerfile

@@ -2,6 +2,7 @@ FROM nvidia/cuda:12.4.1-runtime-ubuntu22.04
 
 ENV DEBIAN_FRONTEND=noninteractive
 ENV PYTHONUNBUFFERED=1
+ENV PYTHONPATH=/app
 
 # System dependencies
 RUN apt-get update && apt-get install -y \