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/d3-interpolate/src/index.js

@@ -0,0 +1,21 @@
+export {default as interpolate} from "./value.js";
+export {default as interpolateArray} from "./array.js";
+export {default as interpolateBasis} from "./basis.js";
+export {default as interpolateBasisClosed} from "./basisClosed.js";
+export {default as interpolateDate} from "./date.js";
+export {default as interpolateDiscrete} from "./discrete.js";
+export {default as interpolateHue} from "./hue.js";
+export {default as interpolateNumber} from "./number.js";
+export {default as interpolateNumberArray} from "./numberArray.js";
+export {default as interpolateObject} from "./object.js";
+export {default as interpolateRound} from "./round.js";
+export {default as interpolateString} from "./string.js";
+export {interpolateTransformCss, interpolateTransformSvg} from "./transform/index.js";
+export {default as interpolateZoom} from "./zoom.js";
+export {default as interpolateRgb, rgbBasis as interpolateRgbBasis, rgbBasisClosed as interpolateRgbBasisClosed} from "./rgb.js";
+export {default as interpolateHsl, hslLong as interpolateHslLong} from "./hsl.js";
+export {default as interpolateLab} from "./lab.js";
+export {default as interpolateHcl, hclLong as interpolateHclLong} from "./hcl.js";
+export {default as interpolateCubehelix, cubehelixLong as interpolateCubehelixLong} from "./cubehelix.js";
+export {default as piecewise} from "./piecewise.js";
+export {default as quantize} from "./quantize.js";