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/tailwindcss/lib/util/buildMediaQuery.js

@@ -0,0 +1,27 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", {
+    value: true
+});
+Object.defineProperty(exports, "default", {
+    enumerable: true,
+    get: function() {
+        return buildMediaQuery;
+    }
+});
+function buildMediaQuery(screens) {
+    screens = Array.isArray(screens) ? screens : [
+        screens
+    ];
+    return screens.map((screen)=>{
+        let values = screen.values.map((screen)=>{
+            if (screen.raw !== undefined) {
+                return screen.raw;
+            }
+            return [
+                screen.min && `(min-width: ${screen.min})`,
+                screen.max && `(max-width: ${screen.max})`
+            ].filter(Boolean).join(" and ");
+        });
+        return screen.not ? `not all and ${values}` : values;
+    }).join(", ");
+}