chore(deno): finish import extensions for sites/mp-sync paths

- sites/mp-sync relative imports already carry extensions; drop the biome
  useImportExtensions override and --unstable-sloppy-imports in typecheck:deno
- mp-sync scripts: deno shebang (+x), static `import YAML from "yaml"`,
  README/usage switched to `deno run -A`
- verified: check.mjs --to e6820a8 (49 unchanged), movieclaw-import --check (0 diff)

Co-Authored-By: Claude Fable 5.1 <[email protected]>

scripts/mp-sync/check.mjs

@@ -1,8 +1,8 @@
-#!/usr/bin/env node
+#!/usr/bin/env -S deno run -A
 /**
  * 比较 ledger.json 与 MoviePilot 目标提交,列出需要跟随移植的上游变化。
  *
- *   node scripts/mp-sync/check.mjs [--mp <MP 仓库路径>] [--to <目标提交,默认 HEAD>] [--json]
+ *   deno run -A scripts/mp-sync/check.mjs [--mp <MP 仓库路径>] [--to <目标提交,默认 HEAD>] [--json]
  *
  * 输出:已变更 / 已删除 / 未变化 的 ledger 文件,监视目录(spider/、parser/)中 ledger 未收录的新文件,
  * 以及逐文件 `git diff` 命令。存在变化时退出码为 1(可用于 CI 或定时提醒)。
@@ -59,7 +59,7 @@ if (args.json) {
   console.log(`未变化:${unchanged.length}`);
   if (changed.length || deleted.length || added.length) {
     console.log(
-      "\n处理流程:按 diff 增量移植 → 把对应源码文件头 `@mp-source ... @ <提交>` 改为新提交(新文件新增标签)→ node scripts/mp-sync/build-ledger.mjs --commit <新提交> → 测试。",
+      "\n处理流程:按 diff 增量移植 → 把对应源码文件头 `@mp-source ... @ <提交>` 改为新提交(新文件新增标签)→ deno run -A scripts/mp-sync/build-ledger.mjs --commit <新提交> → 测试。",
     );
   }
 }