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/core-js-pure/features/url/can-parse.js

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+'use strict';
+module.exports = require('../../full/url/can-parse');

node_modules/core-js-pure/features/url/index.js

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+'use strict';
+module.exports = require('../../full/url');

node_modules/core-js-pure/features/url/parse.js

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+'use strict';
+module.exports = require('../../full/url/parse');

node_modules/core-js-pure/features/url/to-json.js

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+'use strict';
+module.exports = require('../../full/url/to-json');