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/is-number-object/test/index.js

@@ -0,0 +1,40 @@
+'use strict';
+
+var test = require('tape');
+var isNumber = require('../');
+var hasToStringTag = require('has-tostringtag/shams')();
+
+test('not Numbers', function (t) {
+	// @ts-expect-error
+	t.notOk(isNumber(), 'undefined is not Number');
+	t.notOk(isNumber(null), 'null is not Number');
+	t.notOk(isNumber(false), 'false is not Number');
+	t.notOk(isNumber(true), 'true is not Number');
+	t.notOk(isNumber('foo'), 'string is not Number');
+	t.notOk(isNumber([]), 'array is not Number');
+	t.notOk(isNumber({}), 'object is not Number');
+	t.notOk(isNumber(function () {}), 'function is not Number');
+	t.notOk(isNumber(/a/g), 'regex literal is not Number');
+	t.notOk(isNumber(new RegExp('a', 'g')), 'regex object is not Number');
+	t.notOk(isNumber(new Date()), 'new Date() is not Number');
+	t.end();
+});
+
+test('@@toStringTag', { skip: !hasToStringTag }, function (t) {
+	/** @type {{ toString(): string; valueOf(): number; [Symbol.toStringTag]?: string; }} */
+	var fakeNumber = {
+		toString: function () { return '7'; },
+		valueOf: function () { return 42; }
+	};
+	fakeNumber[Symbol.toStringTag] = 'Number';
+	t.notOk(isNumber(fakeNumber), 'fake Number with @@toStringTag "Number" is not Number');
+	t.end();
+});
+
+test('Numbers', function (t) {
+	t.ok(isNumber(42), 'number is Number');
+	t.ok(isNumber(Object(42)), 'number object is Number');
+	t.ok(isNumber(NaN), 'NaN is Number');
+	t.ok(isNumber(Infinity), 'Infinity is Number');
+	t.end();
+});