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/requirements.txt

@@ -10,7 +10,7 @@ psycopg2-binary==2.9.10
 alembic==1.14.1
 
 # Validation
-pydantic==2.10.4
+pydantic>=2.7.0,<2.10
 pydantic-settings==2.7.1
 
 # Auth
@@ -19,7 +19,7 @@ python-jose[cryptography]==3.3.0
 
 # Task queue
 celery[redis]==5.4.0
-redis==5.2.1
+redis==4.6.0
 
 # AI/ML
 faster-whisper==1.1.0
@@ -36,10 +36,10 @@ markdown==3.7
 
 # Utils
 ffmpeg-python==0.2.0
-httpx==0.28.1
+httpx>=0.23.0,<0.28.0
 aiofiles==24.1.0
 
 # Testing
 pytest==8.3.4
 pytest-asyncio==0.25.0
-httpx==0.28.1
+httpx>=0.23.0,<0.28.0