feat: add package.json for TypeScriptLanguageServer extension

- Mark extension as nodeIsRequired: true (desktop app only)
- Required because LSP integration uses NodeDomain
- Follows Phoenix extension metadata conventions

Author: claude

src/extensions/default/TypeScriptLanguageServer/package.json

@@ -0,0 +1,11 @@
+{
+  "name": "phcode-typescript-lsp",
+  "title": "TypeScript/JavaScript Language Server",
+  "version": "1.0.0",
+  "engines": {
+    "brackets": ">=4.0.0"
+  },
+  "description": "TypeScript/JavaScript Language Server Protocol integration for code intelligence features",
+  "nodeIsRequired": true,
+  "dependencies": {}
+}