refactor: Consolidate configuration management with Zustand store

app/api/emails/domains/route.ts

@@ -1,18 +0,0 @@
-import { getRequestContext } from "@cloudflare/next-on-pages"
-import { NextResponse } from "next/server"
-
-export const runtime = "edge"
-
-export async function GET() {
-  try {
-    const domainString = await getRequestContext().env.SITE_CONFIG.get("EMAIL_DOMAINS")
-
-    return NextResponse.json({ domains: domainString ? domainString.split(',') : ["moemail.app"] })
-  } catch (error) {
-    console.error('Failed to fetch domains:', error)
-    return NextResponse.json(
-      { error: "获取域名列表失败" },
-      { status: 500 }
-    )
-  }
-}