ci: add automated Gitea Actions deployment workflow for Synology NAS

- Add Gitea Actions workflow for automated build and deployment
- Add deployment script for Synology NAS
- Add Docker Compose configurations for production deployment
- Add Gitea runner setup
- Add comprehensive documentation for CI/CD setup
- Add health check endpoint for deployment verification
- Update .gitignore for CI/CD artifacts

.env.gitea-runner.example

@@ -0,0 +1,29 @@
+# Gitea Runner Configuration
+# Kopiere diese Datei zu .env.gitea-runner und passe die Werte an
+
+# ============================================
+# Gitea Instance
+# ============================================
+# URL deiner Gitea-Installation
+# Wenn Gitea auf der gleichen NAS läuft:
+GITEA_URL=http://your-synology-ip:3000
+
+# Wenn Gitea in Docker läuft und im gleichen Netzwerk:
+# GITEA_URL=http://gitea:3000
+
+# ============================================
+# Runner Configuration
+# ============================================
+# Runner Registration Token
+# Generiere diesen Token in Gitea:
+# Repository → Settings → Actions → Runners → Create new Runner
+RUNNER_TOKEN=your_gitea_runner_registration_token_here
+
+# Runner Name (wird in Gitea angezeigt)
+RUNNER_NAME=synology-runner
+
+# Maximale Anzahl gleichzeitiger Jobs
+RUNNER_CAPACITY=1
+
+# Log Level: trace, debug, info, warn, error, fatal
+LOG_LEVEL=info