feat(admin): 所有后台页统一页头（标题+说明+刷新+主操作），新默认 logo 与站名字体

- 13 个后台页统一 page-head：左标题与一行说明，右侧刷新与主操作，刷新位置一致
- 渠道/并发/违禁词/订单/邀请日志/作品/首页内容/系统配置补齐或改写标题
- 违禁词与订单页改用统一 toolbar，订单筛选胶囊改下拉
- 站名字体改站酷快乐体（英文数字 5KB 子集 + 汉字按需加载）并加粗描边
- 默认 logo 重画：墨黑圆角方块 + 白色星芒 + 暖橙点，favicon 同步

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frontend/public/favicon.svg

@@ -1,17 +1,17 @@
-<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 48 48" width="48" height="48" fill="none">
+<svg width="48" height="48" viewBox="0 0 48 48" fill="none" xmlns="http://www.w3.org/2000/svg">
   <defs>
-    <linearGradient id="ring" x1="6" y1="6" x2="42" y2="42" gradientUnits="userSpaceOnUse">
-      <stop stop-color="#e879f9"/><stop offset=".5" stop-color="#8b5cf6"/><stop offset="1" stop-color="#38bdf8"/>
+    <linearGradient id="bg" x1="8" y1="4" x2="40" y2="44" gradientUnits="userSpaceOnUse">
+      <stop stop-color="#3f3f46"/>
+      <stop offset="1" stop-color="#18181b"/>
     </linearGradient>
-    <linearGradient id="v" x1="14" y1="14" x2="34" y2="34" gradientUnits="userSpaceOnUse">
-      <stop stop-color="#f0abfc"/><stop offset="1" stop-color="#8b5cf6"/>
+    <linearGradient id="shine" x1="24" y1="3" x2="24" y2="24" gradientUnits="userSpaceOnUse">
+      <stop stop-color="#fff" stop-opacity="0.14"/>
+      <stop offset="0.9" stop-color="#fff" stop-opacity="0"/>
     </linearGradient>
   </defs>
-  <g transform="translate(24 24)">
-    <circle r="18.5" fill="none" stroke="url(#ring)" stroke-width="3.6" stroke-linecap="round"
-            stroke-dasharray="86 30" transform="rotate(-58)"/>
-    <path d="M-8 -7.5 L0 9 L8 -7.5" fill="none" stroke="url(#v)" stroke-width="5.2"
-          stroke-linecap="round" stroke-linejoin="round"/>
-    <circle cx="13" cy="-13" r="3.6" fill="#38bdf8"/>
-  </g>
+  <rect x="2" y="2" width="44" height="44" rx="15" fill="url(#bg)"/>
+  <rect x="2" y="2" width="44" height="22" rx="15" fill="url(#shine)"/>
+  <path d="M22 11 Q23.4 22.6 35 24 Q23.4 25.4 22 37 Q20.6 25.4 9 24 Q20.6 22.6 22 11 Z" fill="#fff" stroke="#fff" stroke-width="2.2" stroke-linejoin="round"/>
+  <path d="M35.5 9 Q36.2 13.8 41 14.5 Q36.2 15.2 35.5 20 Q34.8 15.2 30 14.5 Q34.8 13.8 35.5 9 Z" fill="#fff" stroke="#fff" stroke-width="1.4" stroke-linejoin="round" opacity="0.92"/>
+  <circle cx="36" cy="36" r="2.6" fill="#fb923c"/>
 </svg>