feat(build): migrate scripts from JavaScript to TypeScript

- Convert all scripts in scripts/fetch/, scripts/generate/, scripts/refactor/ from .mjs to .ts
- Update package.json scripts to use tsx instead of node for TypeScript execution
- Add tsx as dev dependency for TypeScript script execution
- Enable incremental TypeScript compilation for faster builds
- Update cspell.json to include TypeScript file patterns

This enables better type safety and developer experience when working with build scripts.

Co-Authored-By: Claude <noreply@anthropic.com>

Author: ericyangpan

cspell.json

@@ -43,6 +43,15 @@
   "useGitignore": true,
   "ignorePaths": ["cloudflare-env.d.ts", "docs", ".claude"],
   "words": [
+    "Autorisierungsaufträgen",
+    "Entwicklungsframework",
+    "İçgörüleri",
+    "Versionierungsschema",
+    "interoperáveis",
+    "mengkomunikasikan",
+    "önekiyle",
+    "sağlayıcılı",
+    "ccstatusline",
     "API'lerle",
     "aracidir",
     "Anthropics",
@@ -120,6 +129,7 @@
     "Tasarlanmistir",
     "tasarlandi",
     "Türkçe",
+    "TSESTree",
     "Vervollständigungstool",
     "agentco",
     "agentico",