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/app/(auth)/forgot-password/page.tsx

@@ -0,0 +1,5 @@
+import ForgotPasswordForm from "@/components/auth/forgot-password-form"
+
+export default function ForgotPasswordPage() {
+    return <ForgotPasswordForm />
+}