fix(ime): 持久化 IME 守卫脚本并挂入 build/prepare/bundle 构建路径

- scripts/apply-ime-guard.mjs 纳入版本库（此前 untracked，重 clone 即丢）
- Univer InputNumber 在 document capture 拦截全页 ↑/↓ 且无 isComposing
  守卫，会摧毁中文输入法组合；prepare/bundle 裸 tsdown 重建会产出无守卫
  的 lib/client.js，2026-08-11 因此复发（dsh-external/issues#562）
- 脚本幂等：已注入则跳过；目标模式匹配不到则 exit 1 显式失败

Fixes #562

package.json

@@ -51,11 +51,11 @@
     "src"
   ],
   "scripts": {
-    "build": "rm -rf lib && tsc -p tsconfig.build.json && tsdown",
+    "build": "rm -rf lib && tsc -p tsconfig.build.json && tsdown && node scripts/apply-ime-guard.mjs",
     "typecheck": "tsc --noEmit",
-    "bundle": "tsdown",
+    "bundle": "tsdown && node scripts/apply-ime-guard.mjs",
     "watch": "tsdown --watch",
-    "prepare": "tsdown",
+    "prepare": "tsdown && node scripts/apply-ime-guard.mjs",
     "test": "vitest run"
   },
   "license": "MIT",