fix: API key save network error — add ENCRYPTION_KEY env and auto-migrate

The "Netzwerkfehler beim Speichern des Schlüssels" was caused by two issues:
1. ENCRYPTION_KEY env var was not passed to the Docker container, so
   AES-256-GCM encrypt() threw at runtime on every POST/PATCH.
2. The 0003_tenant_api_keys migration was not in the drizzle journal
   and no migration runner existed in the Docker image.

Changes:
- docker-compose.yml: pass ENCRYPTION_KEY to app container
- .env.example: document ENCRYPTION_KEY with generation command
- .gitignore: allow .env.example to be tracked
- Dockerfile: include drizzle/ migrations and entrypoint script
- entrypoint.sh: run migrations before starting the app
- migrate.mjs: runtime migration script using drizzle-orm migrator
- drizzle journal: register 0003_tenant_api_keys migration

Co-Authored-By: Paperclip <noreply@paperclip.ing>

entrypoint.sh

@@ -0,0 +1,4 @@
+#!/bin/sh
+set -e
+node migrate.mjs
+exec node server.js