docs: migrate documentation from VitePress to Starlight (#361)

- Replace VitePress with Astro Starlight for documentation
- Reorganize document structure with better hierarchy
- Split large documents into sub-modules for better readability
- Add new sections: component, entity-query, serialization, system
- Support both Chinese (default) and English documentation
- Add responsive design and improved navigation

docs/tsconfig.json

@@ -0,0 +1,13 @@
+{
+  "extends": "astro/tsconfigs/strict",
+  "include": [
+    ".astro/types.d.ts",
+    "**/*"
+  ],
+  "exclude": [
+    "dist"
+  ],
+  "compilerOptions": {
+    "jsx": "preserve"
+  }
+}