fix scaffold issues across config, data and pages

- enable @astrojs/sitemap (declared in deps but not registered); pin to 3.4.x because 3.5+ requires astro 5
- wire up client-side filter buttons on /projects and /tools for both locales (status filter for projects, type+status for tools)
- normalize lang codes in projects/tools/members data to match the i18n key set ('zh-hans' instead of 'zh')
- drop unused archiver devDependency
- replace the dev-instruction text on the search page with a neutral one-liner
- gitignore local editor and tooling configs

Author: NickCollect

.gitignore

@@ -16,3 +16,9 @@ public/pagefind/
 # OS
 .DS_Store
 Thumbs.db
+
+# Local tooling / editor configs
+.claude/
+CLAUDE.md
+.idea/
+.vscode/

astro.config.mjs

@@ -1,30 +1,15 @@
 import { defineConfig } from 'astro/config';
 import tailwind from '@astrojs/tailwind';
+import sitemap from '@astrojs/sitemap';
 
-// ============================================================
-// TODO: 请根据你的实际部署情况修改 SITE_URL
-//
-// 情况一：GitHub Pages 用户/组织站点（username.github.io）
-//   site: 'https://username.github.io'
-//   不需要设置 base
-//
-// 情况二：GitHub Pages 项目站点（username.github.io/repo-name）
-//   site: 'https://username.github.io'
-//   base: '/repo-name'
-//
-// 情况三：自定义域名
-//   site: 'https://yourdomain.com'
-//   不需要设置 base
-// ============================================================
 const SITE_URL = 'https://montagesubs.github.io';
-// const BASE_PATH = '/montagesubs'; // 如果是项目站点，取消注释并修改
 
 export default defineConfig({
   site: SITE_URL,
-  // base: BASE_PATH, // 如果是项目站点，取消注释
 
   integrations: [
     tailwind(),
+    sitemap(),
   ],
 
   output: 'static',