refactor(deploy): simplify script to git push-based deployment

Replace the previous Next.js build + rsync + archive workflow with a
minimal `push_to_server` helper that only does `git push` to the
`server` remote. Build, install, and start are now expected to be
handled by the server's post-receive hook, removing duplicate logic
and shrinking the script from 164 lines to 46. The old `build`,
`deploy`, `archive`, `setup_env`, and `check_local_build_dir`
functions (along with pnpm/rsync/sshpass usage) have been removed.

scripts/deploy/deploy_web.sh

@@ -1,27 +1,16 @@
 #!/bin/bash
 # ==========================================
-# 生产环境 Web 部署脚本（Next.js）
+# 生产环境 Web 部署脚本（Next.js + git push 模型）
 # 原始 Dart: scripts/deploy/deploy_web.sh
 # ==========================================
 
-# 设置环境配置文件（Next.js 命名：.env.production）
-ENV_FILE="env/.env.production"
-
-# 加载服务器配置
 SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
-source "$SCRIPT_DIR/config/production_server"
-
-# 加载公共函数库
 source "$SCRIPT_DIR/_deploy_lib.sh"
 
 # 主函数
 main() {
-    setup_env "$ENV_FILE"
-    build
-    deploy
-
+    push_to_server "main"
     NEW_VERSION=$(bump_version)
-    archive "$NEW_VERSION"
     purge_cdn_cache
 }