feat(prototype): add upload manager and docker ci

- add prototype upload, list, view, and delete api routes
- add prototype manager ui with search, modal, and theme toggle
- add filesystem-backed zip extraction and serving logic
- switch project to pnpm with updated lockfile and tooling
- add multi-stage dockerfile with standalone next.js output
- add github actions to lint, build, and publish docker images

components/ThemeToggle.tsx

@@ -0,0 +1,51 @@
+"use client";
+
+import { useEffect, useState } from "react";
+import { THEME_STORAGE_KEY } from "@/lib/prototype";
+
+function getInitialTheme() {
+  if (typeof window === "undefined") {
+    return false;
+  }
+
+  const saved = localStorage.getItem(THEME_STORAGE_KEY);
+
+  if (saved === "true") {
+    return true;
+  }
+
+  if (saved === "false") {
+    return false;
+  }
+
+  return window.matchMedia("(prefers-color-scheme: dark)").matches;
+}
+
+function applyTheme(isDark: boolean) {
+  document.documentElement.classList.toggle("dark", isDark);
+}
+
+export function ThemeToggle() {
+  const [darkMode, setDarkMode] = useState(getInitialTheme);
+
+  useEffect(() => {
+    applyTheme(darkMode);
+    localStorage.setItem(THEME_STORAGE_KEY, String(darkMode));
+  }, [darkMode]);
+
+  const toggle = () => {
+    setDarkMode((prev) => !prev);
+  };
+
+  return (
+    <button
+      type="button"
+      onClick={toggle}
+      className="fixed right-8 bottom-8 z-50 flex h-12 w-12 items-center justify-center rounded-full border border-slate-200 bg-white text-xl shadow-md transition hover:-translate-y-0.5 dark:border-slate-700 dark:bg-slate-900"
+      aria-label={darkMode ? "切换到浅色模式" : "切换到深色模式"}
+      title={darkMode ? "浅色模式" : "深色模式"}
+    >
+      {darkMode ? "☀️" : "🌙"}
+    </button>
+  );
+}