Fix TypeScript error: use type-only import for Plugin

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Co-Authored-By: Claude <noreply@anthropic.com>

Author: robdimarco-atxp

vite.config.ts

@@ -1,5 +1,5 @@
 import path from "node:path";
-import { defineConfig, Plugin } from "vite";
+import { defineConfig, type Plugin } from "vite";
 import react from "@vitejs/plugin-react";
 import { cloudflare } from "@cloudflare/vite-plugin";
 import tailwindcss from "@tailwindcss/vite";