feat: Add configurable maximum email limit for users

app/components/emails/email-list.tsx

@@ -49,9 +49,22 @@ export function EmailList({ onEmailSelect, selectedEmailId }: EmailListProps) {
   const [nextCursor, setNextCursor] = useState<string | null>(null)
   const [loadingMore, setLoadingMore] = useState(false)
   const [total, setTotal] = useState(0)
+  const [maxEmails, setMaxEmails] = useState<number>(EMAIL_CONFIG.MAX_ACTIVE_EMAILS)
   const [emailToDelete, setEmailToDelete] = useState<Email | null>(null)
   const { toast } = useToast()
 
+  const fetchMaxEmails = async () => {
+    try {
+      const res = await fetch("/api/config")
+      if (res.ok) {
+        const data = await res.json() as { maxEmails: string }
+        setMaxEmails(Number(data.maxEmails))
+      }
+    } catch (error) {
+      console.error("Failed to fetch max emails:", error)
+    }
+  }
+
   const fetchEmails = async (cursor?: string) => {
     try {
       const url = new URL("/api/emails", window.location.origin)
@@ -112,6 +125,9 @@ export function EmailList({ onEmailSelect, selectedEmailId }: EmailListProps) {
 
   useEffect(() => {
     if (session) fetchEmails()
+    if (session && role !== ROLES.EMPEROR) {
+      fetchMaxEmails()
+    }
   // eslint-disable-next-line react-hooks/exhaustive-deps
   }, [session])
 
@@ -173,7 +189,7 @@ export function EmailList({ onEmailSelect, selectedEmailId }: EmailListProps) {
               {role === ROLES.EMPEROR ? (
                 `${total}/∞ 个邮箱`
               ) : (
-                `${total}/${EMAIL_CONFIG.MAX_ACTIVE_EMAILS} 个邮箱`
+                `${total}/${maxEmails} 个邮箱`
               )}
             </span>
           </div>

app/components/profile/config-panel.tsx

@@ -13,11 +13,13 @@ import {
   SelectTrigger,
   SelectValue,
 } from "@/components/ui/select"
+import { EMAIL_CONFIG } from "@/config"
 
 export function ConfigPanel() {
   const [defaultRole, setDefaultRole] = useState<string>("")
   const [emailDomains, setEmailDomains] = useState<string>("")
   const [adminContact, setAdminContact] = useState<string>("")
+  const [maxEmails, setMaxEmails] = useState<string>(EMAIL_CONFIG.MAX_ACTIVE_EMAILS.toString())
   const [loading, setLoading] = useState(false)
   const { toast } = useToast()
 
@@ -31,10 +33,14 @@ export function ConfigPanel() {
     if (res.ok) {
       const data = await res.json() as { 
         defaultRole: Exclude<Role, typeof ROLES.EMPEROR>,
-        emailDomains: string
+        emailDomains: string,
+        adminContact: string,
+        maxEmails: string
       }
       setDefaultRole(data.defaultRole)
       setEmailDomains(data.emailDomains)
+      setAdminContact(data.adminContact)
+      setMaxEmails(data.maxEmails || EMAIL_CONFIG.MAX_ACTIVE_EMAILS.toString())
     }
   }
 
@@ -47,7 +53,8 @@ export function ConfigPanel() {
         body: JSON.stringify({ 
           defaultRole, 
           emailDomains,
-          adminContact 
+          adminContact,
+          maxEmails: maxEmails || EMAIL_CONFIG.MAX_ACTIVE_EMAILS.toString()
         }),
       })
 
@@ -112,6 +119,20 @@ export function ConfigPanel() {
           </div>
         </div>
 
+        <div className="flex items-center gap-4">
+          <span className="text-sm">最大邮箱数量:</span>
+          <div className="flex-1">
+            <Input 
+              type="number"
+              min="1"
+              max="100"
+              value={maxEmails}
+              onChange={(e) => setMaxEmails(e.target.value)}
+              placeholder={`默认为 ${EMAIL_CONFIG.MAX_ACTIVE_EMAILS}`}
+            />
+          </div>
+        </div>
+
         <Button 
           onClick={handleSave}
           disabled={loading}