infra: migrate deployment to Coolify with Garage S3

- Remove docker-compose files (Coolify manages services individually)
- Replace MinIO with Garage (S3-compatible, actively maintained)
- Add CI deploy job: build+push :develop image on every green Develop push
- Add Coolify webhook trigger for automatic redeployment
- Update README, .env.example, and storage references
- Rename migrate script to provider-agnostic name

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

.gitea/workflows/ci.yml

@@ -29,6 +29,31 @@ jobs:
       - name: Build
         run: bun run build
 
+  deploy:
+    needs: ci
+    if: gitea.ref == 'refs/heads/Develop' && gitea.event_name == 'push'
+    runs-on: dind
+    steps:
+      - name: Clone repository
+        run: |
+          apk add --no-cache git curl docker-cli
+          git clone https://${{ secrets.GITEA_TOKEN }}@gitea.jeanlucmakiola.de/${{ gitea.repository }}.git repo
+          cd repo
+          git checkout Develop
+
+      - name: Build and push Docker image
+        working-directory: repo
+        run: |
+          REGISTRY="gitea.jeanlucmakiola.de"
+          IMAGE="${REGISTRY}/${{ gitea.repository_owner }}/gearbox"
+          docker build -t "${IMAGE}:develop" .
+          echo "${{ secrets.REGISTRY_TOKEN }}" | docker login "$REGISTRY" -u "${{ gitea.repository_owner }}" --password-stdin
+          docker push "${IMAGE}:develop"
+
+      - name: Trigger Coolify deploy
+        run: |
+          curl -s -X GET "${{ secrets.COOLIFY_WEBHOOK }}"
+
   e2e:
     if: false  # E2E tests need rewrite: auth moved from local login to OIDC (Logto). Tests still expect username/password flow.
     needs: ci