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/react-hook-form/dist/constants.d.ts

@@ -0,0 +1,27 @@
+export declare const EVENTS: {
+    readonly BLUR: "blur";
+    readonly FOCUS_OUT: "focusout";
+    readonly CHANGE: "change";
+    readonly SUBMIT: "submit";
+    readonly TRIGGER: "trigger";
+    readonly VALID: "valid";
+};
+export declare const VALIDATION_MODE: {
+    readonly onBlur: "onBlur";
+    readonly onChange: "onChange";
+    readonly onSubmit: "onSubmit";
+    readonly onTouched: "onTouched";
+    readonly all: "all";
+};
+export declare const INPUT_VALIDATION_RULES: {
+    readonly max: "max";
+    readonly min: "min";
+    readonly maxLength: "maxLength";
+    readonly minLength: "minLength";
+    readonly pattern: "pattern";
+    readonly required: "required";
+    readonly validate: "validate";
+};
+export declare const FORM_ERROR_TYPE = "form";
+export declare const ROOT_ERROR_TYPE = "root";
+//# sourceMappingURL=constants.d.ts.map