Initial scaffold: full-stack RackMapper application

Complete project scaffold with working auth, REST API, Prisma/SQLite
schema, Docker config, and React frontend for both Rack Planner and
Service Mapper modules. Both server and client pass TypeScript strict
mode with zero errors. Initial migration applied.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

client/src/components/ui/Skeleton.tsx

@@ -0,0 +1,29 @@
+import { cn } from '../../lib/utils';
+
+interface SkeletonProps {
+  className?: string;
+}
+
+export function Skeleton({ className }: SkeletonProps) {
+  return (
+    <div
+      className={cn('animate-pulse rounded bg-slate-700/60', className)}
+      aria-hidden="true"
+    />
+  );
+}
+
+export function RackSkeleton() {
+  return (
+    <div className="flex gap-4 p-4">
+      {[1, 2].map((i) => (
+        <div key={i} className="w-48 flex flex-col gap-1">
+          <Skeleton className="h-6 w-full mb-2" />
+          {Array.from({ length: 12 }).map((_, j) => (
+            <Skeleton key={j} className="h-7 w-full" />
+          ))}
+        </div>
+      ))}
+    </div>
+  );
+}