Initial commit: Developer Tools MVP with visual editor

- Complete React app with 7 developer tools
- JSON Tool with visual structured editor
- Serialize Tool with visual structured editor
- URL, Base64, CSV/JSON, Beautifier, Diff tools
- Responsive navigation with dropdown menu
- Dark/light mode toggle
- Mobile-responsive design with sticky header
- All tools working with copy/paste functionality

node_modules/jiti/dist/plugins/babel-plugin-transform-import-meta.d.ts

@@ -0,0 +1,4 @@
+import type { PluginObj } from "@babel/core";
+export declare function TransformImportMetaPlugin(_ctx: any, opts: {
+    filename?: string;
+}): PluginObj;

node_modules/jiti/dist/plugins/import-meta-env.d.ts

@@ -0,0 +1,5 @@
+/**
+ * Forked from https://github.com/iendeavor/import-meta-env/tree/main/packages/babel 0.4.2 (MIT License - Copyright (c) 2021 Ernest)
+ */
+import type { PluginObj } from "@babel/core";
+export declare function importMetaEnvPlugin({ template, types }: any): PluginObj;