refactor: 重写 Git hooks 体系，委托已有检查、新增模板与 LFS 校验

pre-commit 代码检查改为委托 _backend-lint / _versionctl-lint / _frontend-check，新增 LFS 指针校验；commit-msg 新增多行空行格式校验和模板注释忽略，移除 CJK/Python 字符集检测；新增 prepare-commit-msg 提交信息模板；hooks-install 增加 source 文件存在性校验；前端 check 补入 tsc -b 类型检查并修复暴露的类型错误

frontend/package.json

@@ -6,12 +6,13 @@
   "type": "module",
   "scripts": {
     "dev": "vite",
-    "build": "tsc -b && bun run check && vite build",
+    "build": "bun run check && vite build",
     "lint": "eslint .",
     "lint:fix": "eslint . --fix",
     "format": "prettier --write .",
     "format:check": "prettier --check .",
-    "check": "bun run lint && bun run format:check",
+    "typecheck": "tsc -b",
+    "check": "bun run typecheck && bun run lint && bun run format:check",
     "fix": "bun run lint:fix && bun run format",
     "preview": "vite preview",
     "test": "vitest run",