fix: use declare module syntax for type definitions

- Change from standalone .d.ts to module augmentation style
- Now properly declares types for the CSV module path
- Fixes TypeScript module resolution

Co-authored-by: Qwen-Coder <qwen-coder@alibabacloud.com>

csv-loader.md

@@ -57,17 +57,19 @@ module.exports = {
 
 ```typescript
 // data.schema.d.ts
-export interface data_schema {
-  name: string;
-  age: number;
-  active: boolean;
-  scores: number[];
+declare module "./data.schema.csv" {
+  export interface data_schema {
+    name: string;
+    age: number;
+    active: boolean;
+    scores: number[];
+  }
+
+  export type RowType = data_schema;
+
+  const data: data_schema[];
+  export default data;
 }
-
-export type RowType = data_schema;
-
-declare const data: data_schema[];
-export default data;
 ```
 
 ### Importing in TypeScript
@@ -79,7 +81,8 @@ import data from './data.schema.csv';
 // data: { name: string; age: number; active: boolean; scores: number[] }[]
 
 // 如果启用了 emitTypes，也可以显式导入类型:
-// import type { RowType } from './data.schema.csv';
+import type { RowType } from './data.schema.csv';
+```
 
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