feat(ui): [UI7-1] 构建通用原子UI组件与业务Hooks

client/src/components/ui/skeleton.tsx

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+import { cn } from "../../lib/utils";
+
+export function Skeleton({ className, ...props }: React.HTMLAttributes<HTMLDivElement>) {
+  return <div className={cn("animate-pulse rounded-md bg-slate-200", className)} {...props} />;
+}

client/src/components/ui/sonner.tsx

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+import { Toaster as SonnerToaster } from "sonner";
+
+export function Toaster() {
+  return (
+    <SonnerToaster
+      position="top-right"
+      duration={3000}
+      toastOptions={{
+        className:
+          "border border-slate-200 bg-white text-slate-900 shadow-lg rounded-lg text-sm",
+      }}
+    />
+  );
+}

client/src/components/ui/spinner.tsx

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+import { cn } from "../../lib/utils";
+
+const sizeMap = {
+  sm: "h-4 w-4",
+  md: "h-6 w-6",
+} as const;
+
+export function Spinner({
+  size = "md",
+  className,
+}: {
+  size?: "sm" | "md";
+  className?: string;
+}) {
+  return (
+    <svg
+      className={cn("animate-spin text-slate-400", sizeMap[size], className)}
+      fill="none"
+      viewBox="0 0 24 24"
+    >
+      <circle
+        className="opacity-25"
+        cx="12"
+        cy="12"
+        r="10"
+        stroke="currentColor"
+        strokeWidth="4"
+      />
+      <path
+        className="opacity-75"
+        fill="currentColor"
+        d="M4 12a8 8 0 018-8V0C5.373 0 0 5.373 0 12h4zm2 5.291A7.962 7.962 0 014 12H0c0 3.042 1.135 5.824 3 7.938l3-2.647z"
+      />
+    </svg>
+  );
+}