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/entities/dist/commonjs/encode.d.ts

@@ -0,0 +1,22 @@
+/**
+ * Encodes all characters in the input using HTML entities. This includes
+ * characters that are valid ASCII characters in HTML documents, such as `#`.
+ *
+ * To get a more compact output, consider using the `encodeNonAsciiHTML`
+ * function, which will only encode characters that are not valid in HTML
+ * documents, as well as non-ASCII characters.
+ *
+ * If a character has no equivalent entity, a numeric hexadecimal reference
+ * (eg. `ü`) will be used.
+ */
+export declare function encodeHTML(input: string): string;
+/**
+ * Encodes all non-ASCII characters, as well as characters not valid in HTML
+ * documents using HTML entities. This function will not encode characters that
+ * are valid in HTML documents, such as `#`.
+ *
+ * If a character has no equivalent entity, a numeric hexadecimal reference
+ * (eg. `ü`) will be used.
+ */
+export declare function encodeNonAsciiHTML(input: string): string;
+//# sourceMappingURL=encode.d.ts.map