feat: create Gitea Actions CI/CD workflow

Co-Authored-By: Claude <noreply@anthropic.com>

docs/plans/2026-08-18-implement-deployment-infrastructure.md

@@ -66,15 +66,15 @@
 - [x] verify docker-compose.yml syntax with `docker-compose config`
 
 ### Task 3: Create Gitea Actions CI/CD Workflow
-- [ ] create `.gitea/workflows/deploy.yml` file
-- [ ] add checkout step (actions/checkout@v3)
-- [ ] add setup Go step (actions/setup-go@v4, go-version: '1.22')
-- [ ] add Go modules cache step (actions/cache@v3)
-- [ ] add lint & test step (golangci-lint, go test -v -race ./...)
-- [ ] add Docker Buildx setup step (docker/setup-buildx-action@v2)
-- [ ] add Docker login step (docker/login-action@v2)
-- [ ] add Docker build & push step (docker/build-push-action@v4, tags: latest and {{.CommitID}})
-- [ ] verify Gitea Actions workflow YAML syntax
+- [x] create `.gitea/workflows/deploy.yml` file
+- [x] add checkout step (actions/checkout@v3)
+- [x] add setup Go step (actions/setup-go@v4, go-version: '1.22')
+- [x] add Go modules cache step (actions/cache@v3)
+- [x] add lint & test step (golangci-lint, go test -v -race ./...)
+- [x] add Docker Buildx setup step (docker/setup-buildx-action@v2)
+- [x] add Docker login step (docker/login-action@v2)
+- [x] add Docker build & push step (docker/build-push-action@v4, tags: latest and {{.CommitID}})
+- [x] verify Gitea Actions workflow YAML syntax
 
 ### Task 4: Verify acceptance criteria
 - [ ] verify Dockerfile matches multi-stage specification