Cleanup repo, add Gitea CI/CD workflow, improve error handling

- Remove temp files and reorganize docs
- Add .gitea/workflows/deploy.yml for automated deployment
- Add unreachable host checks to server routes (/:id, logs, start/stop/restart)
- Add unreachable checks to config routes (zomboid, terraria, openttd)
- Return HTTP 503 with unreachable flag instead of crashing

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.gitea/workflows/deploy.yml

@@ -0,0 +1,63 @@
+name: Deploy GSM
+
+on:
+  push:
+    branches: [main]
+    paths:
+      - 'gsm-backend/**'
+      - 'gsm-frontend/**'
+  workflow_dispatch:
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+
+      - name: Install backend dependencies
+        run: |
+          cd gsm-backend
+          npm ci --production
+
+      - name: Install frontend dependencies and build
+        run: |
+          cd gsm-frontend
+          npm ci
+          npm run build
+
+      - name: Deploy Backend
+        uses: appleboy/scp-action@v0.1.7
+        with:
+          host: 192.168.2.30
+          username: root
+          key: ${{ secrets.SSH_DEPLOY_KEY }}
+          source: "gsm-backend/"
+          target: "/opt/gameserver-monitor/"
+          strip_components: 1
+
+      - name: Deploy Frontend
+        uses: appleboy/scp-action@v0.1.7
+        with:
+          host: 192.168.2.30
+          username: root
+          key: ${{ secrets.SSH_DEPLOY_KEY }}
+          source: "gsm-frontend/dist/"
+          target: "/opt/gameserver-monitor/frontend/"
+          strip_components: 2
+
+      - name: Restart Services
+        uses: appleboy/ssh-action@v1.0.3
+        with:
+          host: 192.168.2.30
+          username: root
+          key: ${{ secrets.SSH_DEPLOY_KEY }}
+          script: |
+            cd /opt/gameserver-monitor
+            pm2 restart gsm-backend || pm2 start backend/server.js --name gsm-backend
+            echo "Deploy complete!"