chore(部署): 增加 Docker 部署配置

关键改动：

- 新增本地和生产 Docker Compose、Web/Server Dockerfile 与 Nginx 模板

- 增加生产部署校验脚本、环境变量示例和 Prisma 初始迁移

- 更新部署文档、README 和架构/决策/流程/路线图说明

Co-Authored-By: Codex GPT-5 <codex@openai.com>

deploy/nginx/default.conf.template

@@ -0,0 +1,26 @@
+server {
+    listen 80;
+    server_name ${SERVER_NAME};
+    client_max_body_size ${CLIENT_MAX_BODY_SIZE};
+
+    proxy_http_version 1.1;
+    proxy_set_header Host $host;
+    proxy_set_header X-Real-IP $remote_addr;
+    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+    proxy_set_header X-Forwarded-Host $host;
+    proxy_set_header X-Forwarded-Proto $scheme;
+
+    location /api/ {
+        proxy_pass http://server:3001;
+        proxy_read_timeout 120s;
+        proxy_send_timeout 120s;
+    }
+
+    location / {
+        proxy_pass http://web:3000;
+        proxy_set_header Upgrade $http_upgrade;
+        proxy_set_header Connection "upgrade";
+        proxy_read_timeout 120s;
+        proxy_send_timeout 120s;
+    }
+}