feat(frontend): add API client, layout, and routing

- Create Axios-based API client with sources, jobs, and dashboard endpoints
- Add responsive Layout component with navigation sidebar
- Set up React Router with Dashboard, Backups, and Settings routes
- Configure TanStack Query provider with default options
- Use lucide-react for navigation icons

frontend/node_modules/redent/readme.md

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+# redent [![Build Status](https://travis-ci.org/sindresorhus/redent.svg?branch=master)](https://travis-ci.org/sindresorhus/redent)
+
+> [Strip redundant indentation](https://github.com/sindresorhus/strip-indent) and [indent the string](https://github.com/sindresorhus/indent-string)
+
+
+## Install
+
+```
+$ npm install redent
+```
+
+
+## Usage
+
+```js
+const redent = require('redent');
+
+redent('\n  foo\n    bar\n', 1);
+//=> '\n foo\n   bar\n'
+```
+
+
+## API
+
+### redent(string, [count], [options])
+
+#### string
+
+Type: `string`
+
+The string to normalize indentation.
+
+#### count
+
+Type: `number`<br>
+Default: `0`
+
+How many times you want `options.indent` repeated.
+
+#### options
+
+Type: `object`
+
+##### indent
+
+Type: `string`<br>
+Default: `' '`
+
+The string to use for the indent.
+
+##### includeEmptyLines
+
+Type: `boolean`<br>
+Default: `false`
+
+Also indent empty lines.
+
+
+## License
+
+MIT © [Sindre Sorhus](https://sindresorhus.com)