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/strip-literal/dist/index.d.ts

@@ -0,0 +1,35 @@
+import * as js_tokens from 'js-tokens';
+import { Token } from 'js-tokens';
+
+interface StripLiteralOptions {
+    /**
+     * Will be called for each string literal. Return false to skip stripping.
+     */
+    filter?: (s: string) => boolean;
+    /**
+     * Fill the stripped literal with this character.
+     * It must be a single character.
+     *
+     * @default ' '
+     */
+    fillChar?: string;
+}
+
+declare function stripLiteralJsTokens(code: string, options?: StripLiteralOptions): {
+    result: string;
+    tokens: Token[];
+};
+
+/**
+ * Strip literal from code.
+ */
+declare function stripLiteral(code: string, options?: StripLiteralOptions): string;
+/**
+ * Strip literal from code, return more detailed information.
+ */
+declare function stripLiteralDetailed(code: string, options?: StripLiteralOptions): {
+    result: string;
+    tokens: js_tokens.Token[];
+};
+
+export { type StripLiteralOptions, stripLiteral, stripLiteralDetailed, stripLiteralJsTokens };