chore: 同步 v5.0 基础设施完善到 v5.1

从 v5.0 cherry-pick 的开源项目基础设施改进:

新增配置文件:
- .editorconfig, .gitattributes, .prettierrc, .markdownlint.json
- commitlint.config.js

新增 GitHub 社区文件:
- .github/dependabot.yml — 依赖自动更新
- .github/CODEOWNERS — 自动 PR 审查分配
- .github/FUNDING.yml — 开源赞助入口

新增文档:
- ROADMAP.md — 路线图
- SUPPORT.md — 帮助指南
- docs/screenshots/ — 应用截图

新增 Git Hooks:
- .husky/pre-commit — lint-staged 自动格式化+修复
- .husky/commit-msg — commitlint 校验

CI 强化:
- 新增 Prettier 格式检查
- 新增 Vitest 覆盖率 + Codecov 上报
- 保留 v5.1 已有的 rust-cache + jsdom 全局环境

修复:
- index.html 标题 v4.0 → v5.1
- PathEditDialog set-state-in-effect 改用 useRef prevOpen 守卫
- merge-preview.test.tsx no-explicit-any 修复
- 所有 TS/TSX 文件 Prettier 格式化统一

v5.1 保留特性:
- @tanstack/react-virtual 虚拟滚动
- jsdom 全局测试环境
- Swatinem/rust-cache CI 加速
- 105 测试全部通过

src/hooks/use-path-validation.ts

@@ -60,17 +60,15 @@ export function usePathValidation(paths: readonly PathEntry[]) {
 
     const batch = toValidate.slice(0, 20);
     Promise.all(
-      batch.map(
-        async (p): Promise<[string, ValidationState]> => {
-          try {
-            if (p.path.includes('%')) return [p.path, 'valid'];
-            const valid: boolean = await invoke('validate_path', { path: p.path });
-            return [p.path, valid ? 'valid' : 'invalid'];
-          } catch {
-            return [p.path, 'unknown'];
-          }
-        },
-      ),
+      batch.map(async (p): Promise<[string, ValidationState]> => {
+        try {
+          if (p.path.includes('%')) return [p.path, 'valid'];
+          const valid: boolean = await invoke('validate_path', { path: p.path });
+          return [p.path, valid ? 'valid' : 'invalid'];
+        } catch {
+          return [p.path, 'unknown'];
+        }
+      }),
     ).then((results) => {
       if (cancelled) return;
       for (const [p] of results) validatedRef.current.add(p);
@@ -89,23 +87,19 @@ export function usePathValidation(paths: readonly PathEntry[]) {
   // 异步展开环境变量（setState 在 .then() 回调中）
   useEffect(() => {
     let cancelled = false;
-    const toExpand = paths.filter(
-      (p) => p.path.includes('%') && !expandedRef.current.has(p.path),
-    );
+    const toExpand = paths.filter((p) => p.path.includes('%') && !expandedRef.current.has(p.path));
     if (toExpand.length === 0) return;
 
     const batch = toExpand.slice(0, 20);
     Promise.all(
-      batch.map(
-        async (p): Promise<[string, string]> => {
-          try {
-            const expanded: string = await invoke('expand_env_vars', { path: p.path });
-            return [p.path, expanded !== p.path ? expanded : ''];
-          } catch {
-            return [p.path, ''];
-          }
-        },
-      ),
+      batch.map(async (p): Promise<[string, string]> => {
+        try {
+          const expanded: string = await invoke('expand_env_vars', { path: p.path });
+          return [p.path, expanded !== p.path ? expanded : ''];
+        } catch {
+          return [p.path, ''];
+        }
+      }),
     ).then((results) => {
       if (cancelled) return;
       for (const [p] of results) expandedRef.current.add(p);