feat: add ragflow web project & add pnpm workspace file

ragflow_web/typings.d.ts

@@ -0,0 +1,13 @@
+import '@tanstack/react-table';
+declare module 'lodash';
+
+declare global {
+  type Nullable<T> = T | null;
+}
+
+declare module '@tanstack/react-table' {
+  interface ColumnMeta {
+    headerClassName?: string;
+    cellClassName?: string;
+  }
+}