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/alembic/script.py.mako

@@ -0,0 +1,26 @@
+"""${message}
+
+Revision ID: ${up_revision}
+Revises: ${down_revision | comma,n}
+Create Date: ${create_date}
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+${imports if imports else ""}
+
+# revision identifiers, used by Alembic.
+revision: str = ${repr(up_revision)}
+down_revision: Union[str, None] = ${repr(down_revision)}
+branch_labels: Union[str, Sequence[str], None] = ${repr(branch_labels)}
+depends_on: Union[str, Sequence[str], None] = ${repr(depends_on)}
+
+
+def upgrade() -> None:
+    ${upgrades if upgrades else "pass"}
+
+
+def downgrade() -> None:
+    ${downgrades if downgrades else "pass"}