ci: Add Gitea Actions workflow for deployment

- Auto-deploy on push to main
- Pull, build, migrate, restart with PM2

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

.gitea/workflows/deploy.yml

@@ -0,0 +1,53 @@
+name: Deploy Dimension47
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  deploy:
+    runs-on: linux-amd64
+    steps:
+      - name: Pull latest code
+        run: |
+          cd /opt/dimension47
+          git fetch origin
+          git reset --hard origin/main
+
+      - name: Install Server Dependencies
+        run: |
+          cd /opt/dimension47/server
+          npm ci --production=false
+
+      - name: Install Client Dependencies
+        run: |
+          cd /opt/dimension47/client
+          npm ci
+
+      - name: Generate Prisma Client
+        run: |
+          cd /opt/dimension47/server
+          npx prisma generate
+
+      - name: Run Migrations
+        run: |
+          cd /opt/dimension47/server
+          npx prisma migrate deploy
+
+      - name: Build Client
+        run: |
+          cd /opt/dimension47/client
+          npm run build
+
+      - name: Build Server
+        run: |
+          cd /opt/dimension47/server
+          npm run build
+
+      - name: Restart Server
+        run: |
+          pm2 delete dimension47 2>/dev/null || true
+          cd /opt/dimension47/server
+          pm2 start dist/main.js --name dimension47
+          pm2 save