添加 CI/CD 构建配置与部署文件

- deploy/Dockerfile：多阶段构建，node:24-alpine（阿里镜像）构建
  dist，nginx:alpine 作为成品镜像；构建上下文为仓库根目录
- deploy/nginx.conf：Vue Router history 模式 SPA 配置，含 gzip
  压缩和 /assets/ 长期缓存
- deploy/compose.yaml：以 zhican-admin:latest 启动服务，对外暴露
  12801 端口
- .teamcity/pipeline.yaml：main 分支触发，build/deploy 独立 step

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.teamcity/pipeline.yaml

@@ -0,0 +1,25 @@
+name: zhican-admin
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  build:
+    name: 构建 Docker 镜像
+    steps:
+      - name: Docker Build
+        script: |
+          docker build \
+            -f deploy/Dockerfile \
+            -t zhican-admin:latest \
+            .
+
+  deploy:
+    name: 启动服务
+    needs: build
+    steps:
+      - name: Compose Up
+        script: |
+          docker compose -f deploy/compose.yaml up -d