feat(scripts): 添加 PEP 723 脚本元数据并修复 HTTP/2 伪头过滤问题

- 为 build_studio_urls.py 和 lookup_groups.py 添加 PEP 723 依赖声明
- 修复 HTTP/2 伪头导致 requests 抛 InvalidHeader 的问题
- 添加 CDP 端口连通性预检查及启动指引

scripts/install-skills.bat

@@ -1,9 +1,11 @@
 @echo off
-rem Trae CN skill installer launcher - double click to run
+rem Skill installer launcher - double click to run
 rem Actual logic lives in install-skills.ps1 (same folder)
-rem Usage:  install-skills.bat                 (install ALL skills)
-rem         install-skills.bat -Skills a,b,c   (install only those)
-rem         install-skills.bat -DryRun         (preview only, no changes)
+rem Usage:  install-skills.bat                        (install ALL skills to trae-cn)
+rem         install-skills.bat -Agent zcode           (install to %USERPROFILE%\.zcode\skills)
+rem         install-skills.bat -Agent all             (install to every known target)
+rem         install-skills.bat -Skills a,b -Agent all (subset)
+rem         install-skills.bat -DryRun                (preview only, no changes)
 cd /d "%~dp0"
 if not exist "install-skills.ps1" (
     echo [ERROR] install-skills.ps1 not found in %~dp0