fix: resolve Prisma __dirname ESM error in production Docker build

Move @prisma/client and prisma to dependencies so adapter-node
externalizes them instead of bundling. Add ssr.external config
for Vite to prevent inlining Prisma's CJS engine loader.

vite.config.ts

@@ -4,6 +4,10 @@ import { defineConfig } from 'vitest/config';
 
 export default defineConfig({
 	plugins: [tailwindcss(), sveltekit()],
+	ssr: {
+		noExternal: [],
+		external: ['@prisma/client', '.prisma/client']
+	},
 	server: {
 		port: 5181,
 		host: '0.0.0.0'