refactor: clean up login-kicker and update button text

remove the unused .login-kicker CSS class and corresponding span element from the login page
update the login button text to "login" from the original "enter maintenance desk" for more accurate labeling

src/pages/login/LoginPage.tsx

@@ -31,7 +31,6 @@ export function LoginPage({ onDone }: { onDone: () => void }) {
     <main className="login-shell">
       <Card className="login-panel">
         <CardHeader className="p-0">
-          <span className="login-kicker">万趣运营后台</span>
           <CardTitle>万趣小程序管理端</CardTitle>
           <CardDescription>按前台页面结构维护内容、商品和线索。</CardDescription>
         </CardHeader>
@@ -50,7 +49,7 @@ export function LoginPage({ onDone }: { onDone: () => void }) {
                 <AlertDescription>{error}</AlertDescription>
               </Alert>
             ) : null}
-            <Button disabled={loading}>{loading ? "登录中" : "进入维护台"}</Button>
+            <Button disabled={loading}>{loading ? "登录中" : "登录"}</Button>
           </form>
         </CardContent>
       </Card>

src/styles.css

@@ -75,12 +75,6 @@ button {
   border-radius: 8px;
 }
 
-.login-kicker {
-  color: #287d79;
-  font-size: 13px;
-  font-weight: 700;
-}
-
 .login-panel h1 {
   margin: 0 0 8px;
   font-size: 26px;
@@ -3019,10 +3013,6 @@ section.work-area:has(> .lead-toolbar) .empty-row {
   @apply w-full max-w-md rounded-2xl border border-white/80 bg-white/95 p-8 shadow-xl;
 }
 
-.login-kicker {
-  @apply mb-1 w-fit rounded-full border border-teal-200 bg-teal-50 px-3 py-1 text-xs font-bold text-teal-700;
-}
-
 .login-panel h3 {
   @apply text-3xl font-black leading-tight text-slate-950;
 }