feat: Initialize AI Studio project structure

Sets up a new project for an AI Studio application. Includes essential files like `package.json`, `vite.config.ts`, `tsconfig.json`, and a basic React application structure (`App.tsx`, `main.tsx`, `index.html`, `index.css`).

Also adds a `README.md` with instructions for running locally, an `.env.example` for API key configuration, and a `.gitignore` to manage project dependencies and build artifacts.

src/types.ts

@@ -0,0 +1,26 @@
+export type ExcelRow = any[];
+
+export interface AppState {
+  headers: string[];
+  data: ExcelRow[];
+  fileName: string;
+  fileDate: Date | null;
+  hasUnsavedChanges: boolean;
+}
+
+export const COLUMNS = {
+  ARTICLE_NO: 0,
+  ARTICLE_NAME: 2,
+  LINE: 7,
+  LICENSE: 8,
+  DETAILS_EN: 9,
+  DETAILS_DE: 10,
+  BARCODE: 28,
+  TARIFF_CODE: 58,
+  COUNTRY_ORIGIN: 60,
+  LONG_DE: 62,
+  LONG_EN: 63,
+  SHORT_DE: 64,
+  SHORT_EN: 65,
+  RECOMMENDED_AGE: 67
+};