ci: Migrate from GitLab CI/CD to Gitea Actions with CT109 pre-production

**Migration Complete:**
- Removed GitLab CI/CD configuration (.gitlab-ci.yml)
- Created Gitea Actions workflows (.gitea/workflows/)
- Disabled automatic production deployment (manual only)
- Added pre-production deployment to CT109 Docker container

**New Workflows:**
- build-and-deploy.yml: Main CI/CD pipeline with CT109 deployment
- rollback.yml: Manual rollback capability
- README.md: Comprehensive workflow documentation

**Pre-Production Environment (CT109):**
- Host: 10.0.0.51
- User: sysadmin
- Port: 22
- Deploys on push to development/main branches
- Access URL: http://ct109.local:5100

**Documentation:**
- CI_CD_MIGRATION_GITEA.md: Complete migration guide
- CI_CD_CT109_PREPRODUCTION.md: CT109 deployment architecture
- GITEA_SECRETS_SETUP_GUIDE.md: Secrets configuration instructions

**Git Remote Updated:**
- Migrated from GitLab (gitlab.silverlabs.uk) to Gitea (git.silverlabs.uk)
- Using token authentication for push/pull operations

**Next Steps:**
1. Push code to Gitea to create repository
2. Add CT109 secrets via Gitea UI (CT109_HOST, CT109_SSH_PORT, CT109_USER, CT109_SSH_KEY)
3. Test pre-production deployment workflow

🚀 Generated with Claude Code

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

TeleBot/.gitlab-ci.yml

@@ -1,61 +0,0 @@
-variables:
-  DOCKER_HOST: unix:///var/run/docker.sock
-
-stages:
-  - build
-  - deploy
-
-build:
-  stage: build
-  image: docker:24
-  script:
-    - docker build -f TeleBot/Dockerfile -t localhost:5000/telebot:latest ../
-    - docker tag localhost:5000/telebot:latest localhost:5000/telebot:$CI_COMMIT_SHORT_SHA
-    - docker push localhost:5000/telebot:latest
-    - docker push localhost:5000/telebot:$CI_COMMIT_SHORT_SHA
-  rules:
-    - if: '$CI_COMMIT_BRANCH == "main"'
-    - if: '$CI_COMMIT_TAG'
-
-deploy:vps:
-  stage: deploy
-  image: docker:24
-  before_script:
-    - apk add --no-cache openssh-client bash curl
-    - mkdir -p ~/.ssh
-    - chmod 700 ~/.ssh
-    - echo "$VPS_SSH_KEY_B64" | base64 -d > /tmp/deploy_key
-    - chmod 600 /tmp/deploy_key
-    - ssh-keyscan -p "$VPS_PORT" "$VPS_HOST" >> ~/.ssh/known_hosts 2>/dev/null
-  script:
-    - |
-      # Save and transfer Docker image
-      docker save localhost:5000/telebot:latest | ssh -i /tmp/deploy_key -p "$VPS_PORT" "$VPS_USER@$VPS_HOST" "docker load"
-
-      # Deploy on VPS
-      ssh -i /tmp/deploy_key -p "$VPS_PORT" "$VPS_USER@$VPS_HOST" bash -s << 'EOF'
-      cd /opt/telebot
-      docker-compose down
-      docker-compose up -d
-
-      # Health check
-      for i in 1 2 3 4 5 6; do
-        if pgrep -f "dotnet.*TeleBot" > /dev/null 2>&1; then
-          echo "✅ TeleBot deployment successful"
-          exit 0
-        fi
-        echo "Waiting for TeleBot to start... ($i/6)"
-        sleep 10
-      done
-
-      echo "❌ TeleBot deployment failed - health check timeout"
-      docker-compose logs --tail=50
-      exit 1
-      EOF
-  rules:
-    - if: '$CI_COMMIT_BRANCH == "main"'
-      when: on_success
-    - if: '$CI_COMMIT_TAG'
-      when: manual
-  after_script:
-    - rm -f /tmp/deploy_key