chore: remove obsolete CI workflows (deploy-guard, deploy.yml.example)

deploy-guard.yml referenced deleted tests and sudoers files.
deploy.yml.example used legacy SSH-based deployment.
Updated ci.yml and deploy.yml are in .gitignore (need workflow scope to push).

.github/workflows/deploy-guard.yml

@@ -1,34 +0,0 @@
-name: Deploy Guard
-
-on:
-  pull_request:
-    branches: [main]
-
-jobs:
-  deploy-guard:
-    runs-on: ubuntu-latest
-
-    steps:
-      - uses: actions/checkout@v4
-
-      - uses: actions/setup-python@v5
-        with:
-          python-version: '3.11'
-          cache: 'pip'
-
-      - name: Install test dependencies
-        run: pip install pytest
-
-      - name: Run deploy guard tests
-        run: pytest tests/test_deploy_guard.py tests/test_sync_data.py -v -m "not live"
-
-      - name: Validate sudoers syntax (Docker)
-        run: |
-          SUDOERS_FILES=$(find server/ -name 'sudoers-*' -type f)
-          if [ -z "$SUDOERS_FILES" ]; then
-            echo "No sudoers files found, skipping"
-            exit 0
-          fi
-          docker run --rm -v "${{ github.workspace }}:/src:ro" -w /src ubuntu:24.04 \
-            /bin/bash -c "apt-get update -qq && apt-get install -y -qq sudo >/dev/null 2>&1 && \
-            find server/ -name 'sudoers-*' -exec visudo -cf {} \;"

.github/workflows/deploy.yml.example

@@ -1,26 +0,0 @@
-# Example deployment workflow
-# Copy to .github/workflows/deploy.yml and configure secrets:
-#   SERVER_HOST - IP address or hostname of your server
-#   SERVER_USER - SSH user for deployment (e.g., "deploy")
-#   SERVER_SSH_KEY - Private SSH key for authentication
-name: Deploy to Server
-
-on:
-  push:
-    branches:
-      - main
-  workflow_dispatch:
-
-jobs:
-  deploy:
-    runs-on: ubuntu-latest
-    steps:
-      - name: Deploy code
-        uses: appleboy/ssh-action@v1.0.3
-        with:
-          host: ${{ secrets.SERVER_HOST }}
-          username: ${{ secrets.SERVER_USER }}
-          key: ${{ secrets.SERVER_SSH_KEY }}
-          script: |
-            cd /opt/data-analyst/repo
-            /opt/data-analyst/repo/server/deploy.sh