feat(deploy): prepare.sh + config templates, migrate env to deploy/, gitignore rendered outputs

deploy/templates/default.conf.tpl

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+server {
+  listen 80;
+  client_max_body_size {{NGINX_CLIENT_MAX_BODY_SIZE}};
+  # 地址为占位默认值(127.0.0.11=Docker 内嵌 DNS);容器 entrypoint 启动时会按
+  # /etc/resolv.conf 的首个 nameserver 重写本行,兼容 podman aardvark-dns。
+  resolver 127.0.0.11 valid=10s;
+
+  # spec §7 风险接受所假设的 CSP:全部同源,blob:/data: 供 SW/reader 用
+  add_header Content-Security-Policy "default-src 'self'; img-src 'self' blob: data:; worker-src 'self' blob:; style-src 'self' 'unsafe-inline'; connect-src 'self' blob: data:; object-src 'none'; frame-src 'self' blob:" always;
+
+  location /api/ {
+    set $api_upstream http://api:8080;   # 变量式 → 每次按 DNS 解析,scale 后轮询到新副本(spec §11)
+    proxy_pass $api_upstream;            # 无 URI 部分:保留 /api 前缀转发
+    proxy_set_header Host $host;
+    proxy_set_header X-Real-IP $remote_addr;
+    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+  }
+
+  location / {
+    root /usr/share/nginx/html;
+    try_files $uri /index.html;
+  }
+}

deploy/templates/nginx.conf.tpl

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+user  nginx;
+worker_processes  auto;
+
+error_log  /var/log/nginx/error.log notice;
+pid        /var/run/nginx.pid;
+
+events {
+    worker_connections  1024;
+}
+
+http {
+    include       /etc/nginx/mime.types;
+    default_type  application/octet-stream;
+
+    access_log  /var/log/nginx/access.log;
+
+    sendfile        on;
+    keepalive_timeout  65;
+
+    gzip  on;
+    gzip_types text/css application/javascript application/json image/svg+xml;
+
+    include /etc/nginx/conf.d/*.conf;
+}

deploy/templates/redis.conf.tpl

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+# booklib redis 配置 — 由 deploy/prepare.sh 从 templates/redis.conf.tpl 渲染,勿直接编辑产物
+maxmemory {{REDIS_MAXMEMORY}}
+maxmemory-policy {{REDIS_MAXMEMORY_POLICY}}
+dir /data