feat(admin-ui): 引入 Toast 反馈（Ant Design Pro 风格基线）

public/css/admin-components.css

@@ -1,8 +1,63 @@
 /*
  * SaaSShop Admin Components
  * 说明：用于承接 Blade 中零散的 inline style，便于后续统一美化与治理。
+ *
+ * 美化方向：Ant Design Pro 风格（规整、企业中后台范式）
  */
 
+/* Toast（渐进增强：配合 admin.js 展示更友好的反馈提示） */
+.toast-container{
+    position:fixed;
+    top:16px;
+    right:16px;
+    z-index:999;
+    display:flex;
+    flex-direction:column;
+    gap:10px;
+    width:min(420px, calc(100vw - 32px));
+}
+
+.toast{
+    background:#111827;
+    border:1px solid #334155;
+    border-left-width:4px;
+    border-radius:12px;
+    padding:12px 12px;
+    color:#e5e7eb;
+    box-shadow:0 14px 30px rgba(0,0,0,.35);
+    display:flex;
+    align-items:flex-start;
+    justify-content:space-between;
+    gap:12px;
+}
+
+.toast-success{border-left-color:#16a34a;}
+.toast-warning{border-left-color:#f59e0b;}
+.toast-error{border-left-color:#ef4444;}
+
+.toast-content{
+    font-size:13px;
+    line-height:1.45;
+    word-break:break-word;
+}
+
+.toast-close{
+    appearance:none;
+    border:none;
+    background:transparent;
+    color:#94a3b8;
+    font-size:18px;
+    line-height:1;
+    cursor:pointer;
+    padding:2px 6px;
+    border-radius:8px;
+}
+
+.toast-close:hover{
+    background:#1f2937;
+    color:#e5e7eb;
+}
+
 .form-inline-row{
     display:flex;
     align-items:center;