refactor: convert to bun workspaces monorepo

- Move web app into apps/web/
- Create packages/shared/ with shared types
- Create plugins/decky-vault/ scaffold
- Root package.json manages workspaces only

apps/web/next.config.ts

@@ -0,0 +1,56 @@
+import type { NextConfig } from "next";
+import withSerwist from "@serwist/next";
+import { version } from "./package.json";
+
+const nextConfig: NextConfig = {
+  env: {
+    NEXT_PUBLIC_APP_VERSION: version,
+  },
+  // Elysia is Bun-native and must not be bundled by Next.js
+  serverExternalPackages: ["elysia", "@elysiajs/eden", "@elysia/openapi", "@elysia/cron"],
+  images: {
+    remotePatterns: [
+      {
+        protocol: "https",
+        hostname: "cdn.akamai.steamstatic.com",
+        port: "",
+        pathname: "/steam/apps/**",
+      },
+      {
+        protocol: "https",
+        hostname: "shared.akamai.steamstatic.com",
+        port: "",
+        pathname: "/store_item_assets/**",
+      },
+      {
+        protocol: "https",
+        hostname: "cdn.steamgriddb.com",
+      },
+      {
+        protocol: "https",
+        hostname: "cdn2.steamgriddb.com",
+      },
+      // Google
+      {
+        protocol: 'https',
+        hostname: 'lh3.googleusercontent.com'
+      },
+      // Discord
+      {
+        protocol: 'https',
+        hostname: 'cdn.discordapp.com'
+      },
+      // Cloudflare R2
+      {
+        protocol: "https",
+        hostname: "cdn.deckyvault.xyz",
+      }
+    ],
+  },
+};
+
+export default withSerwist({
+  swSrc: "app/sw.ts",
+  swDest: "public/sw.js",
+  disable: process.env.NODE_ENV === "development",
+})(nextConfig);