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/cross-spawn/index.js

@@ -0,0 +1,39 @@
+'use strict';
+
+const cp = require('child_process');
+const parse = require('./lib/parse');
+const enoent = require('./lib/enoent');
+
+function spawn(command, args, options) {
+    // Parse the arguments
+    const parsed = parse(command, args, options);
+
+    // Spawn the child process
+    const spawned = cp.spawn(parsed.command, parsed.args, parsed.options);
+
+    // Hook into child process "exit" event to emit an error if the command
+    // does not exists, see: https://github.com/IndigoUnited/node-cross-spawn/issues/16
+    enoent.hookChildProcess(spawned, parsed);
+
+    return spawned;
+}
+
+function spawnSync(command, args, options) {
+    // Parse the arguments
+    const parsed = parse(command, args, options);
+
+    // Spawn the child process
+    const result = cp.spawnSync(parsed.command, parsed.args, parsed.options);
+
+    // Analyze if the command does not exist, see: https://github.com/IndigoUnited/node-cross-spawn/issues/16
+    result.error = result.error || enoent.verifyENOENTSync(result.status, parsed);
+
+    return result;
+}
+
+module.exports = spawn;
+module.exports.spawn = spawn;
+module.exports.sync = spawnSync;
+
+module.exports._parse = parse;
+module.exports._enoent = enoent;