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

app/globals.css

@@ -1,8 +1,8 @@
 @import "tailwindcss";
 
 :root {
-  --background: #ffffff;
-  --foreground: #171717;
+  --background: #f8fafc;
+  --foreground: #1e293b;
 }
 
 @theme inline {
@@ -12,15 +12,13 @@
   --font-mono: var(--font-geist-mono);
 }
 
-@media (prefers-color-scheme: dark) {
-  :root {
-    --background: #0a0a0a;
-    --foreground: #ededed;
-  }
+.dark {
+  --background: #020617;
+  --foreground: #f8fafc;
 }
 
 body {
-  background: var(--background);
+  background-color: var(--background);
   color: var(--foreground);
-  font-family: Arial, Helvetica, sans-serif;
+  font-family: var(--font-geist-sans), "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
 }