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/postcss-import/lib/resolve-id.js

@@ -0,0 +1,42 @@
+"use strict"
+
+// external tooling
+const resolve = require("resolve")
+
+const moduleDirectories = ["web_modules", "node_modules"]
+
+function resolveModule(id, opts) {
+  return new Promise((res, rej) => {
+    resolve(id, opts, (err, path) => (err ? rej(err) : res(path)))
+  })
+}
+
+module.exports = function (id, base, options) {
+  const paths = options.path
+
+  const resolveOpts = {
+    basedir: base,
+    moduleDirectory: moduleDirectories.concat(options.addModulesDirectories),
+    paths,
+    extensions: [".css"],
+    packageFilter: function processPackage(pkg) {
+      if (pkg.style) pkg.main = pkg.style
+      else if (!pkg.main || !/\.css$/.test(pkg.main)) pkg.main = "index.css"
+      return pkg
+    },
+    preserveSymlinks: false,
+  }
+
+  return resolveModule(`./${id}`, resolveOpts)
+    .catch(() => resolveModule(id, resolveOpts))
+    .catch(() => {
+      if (paths.indexOf(base) === -1) paths.unshift(base)
+
+      throw new Error(
+        `Failed to find '${id}'
+  in [
+    ${paths.join(",\n        ")}
+  ]`
+      )
+    })
+}