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/xmlchars/xmlns/1.0/ed3.d.ts

@@ -0,0 +1,28 @@
+/**
+ * Character class utilities for XML NS 1.0 edition 3.
+ *
+ * @author Louis-Dominique Dubeau
+ * @license MIT
+ * @copyright Louis-Dominique Dubeau
+ */
+export declare const NC_NAME_START_CHAR = "A-Z_a-z\u00C0-\u00D6\u00D8-\u00F6\u00F8-\u02FF\u0370-\u037D\u037F-\u1FFF\u200C-\u200D\u2070-\u218F\u2C00-\u2FEF\u3001-\uD7FF\uF900-\uFDCF\uFDF0-\uFFFD\uD800\uDC00-\uDB7F\uDFFF";
+export declare const NC_NAME_CHAR: string;
+export declare const NC_NAME_START_CHAR_RE: RegExp;
+export declare const NC_NAME_CHAR_RE: RegExp;
+export declare const NC_NAME_RE: RegExp;
+/**
+ * Determines whether a codepoint matches [[NC_NAME_START_CHAR]].
+ *
+ * @param c The code point.
+ *
+ * @returns ``true`` if the codepoint matches.
+ */
+export declare function isNCNameStartChar(c: number): boolean;
+/**
+ * Determines whether a codepoint matches [[NC_NAME_CHAR]].
+ *
+ * @param c The code point.
+ *
+ * @returns ``true`` if the codepoint matches.
+ */
+export declare function isNCNameChar(c: number): boolean;