feat: 易支付积分充值 + 站内公告 + OpenAI 视频修复 + grok/adobe 失败处理

充值/订单(易支付 mapi):
- 订单表 + 30 分钟自动取消;支付弹窗(二维码/跳转监控、倒计时、轮询、5s 倒计时关闭)
- 系统设置可配:开关/商户ID/密钥/支付地址(根地址拼 /mapi)/支付方式/最低额/积分比例(默认 1元=100积分)
- 异步通知 MD5 验签、幂等到账;用户累计充值;前台/后台订单页(筛选+搜索+分页,前后台分风格);用户管理累计充值列

站内公告:
- Markdown 公告,登录用户首次访问/刷新弹出;内容哈希做版本,改了就重新推;管理员不弹;空内容=下线

OpenAI 视频(/v1/videos)修复:
- /content 拿不到视频:grok 资源 URL 需鉴权,改为用生成账号 token 取流;adobe/runway 公开 URL 直代理(不存 RustFS)
- size→分辨率用短边判定(1280x720 = 720p,之前误判 1080p 被拒)

失败处理:
- grok 429「Too many requests」/403 anti-bot 改判临时错误(不再误封号),真额度耗尽才算 quota
- adobe 视频 408 / system under load 归为临时错误 → tempAsDead 封号

其它:
- 充值默认关闭;签到格子浅色可见;登录验证码按钮浅色可读;并发/账户信息展示
- 创作记录/画图台只显示画图台作品(排除 API);日志页 API 视频预览显示 —
- 视频去画中画/下载/投屏(全局);图片缩略图改背景图规避 Edge 视觉搜索
- 订单/兑换码/配置/日志菜单文案与图标;充值版块样式

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

frontend/src/components/AnnouncementModal.vue

@@ -0,0 +1,62 @@
+<script setup>
+import { computed } from 'vue'
+import { marked } from 'marked'
+import { announcement, dismissAnnouncement } from '../announcement'
+import Icon from './Icon.vue'
+
+marked.setOptions({ breaks: true, gfm: true })
+const html = computed(() => marked.parse(announcement.content || ''))
+</script>
+
+<template>
+  <transition name="ann-fade">
+    <div v-if="announcement.show"
+         class="fixed inset-0 z-[80] bg-slate-950/70 backdrop-blur-sm flex items-center justify-center p-4"
+         @click.self="dismissAnnouncement">
+      <div class="w-full max-w-lg rounded-2xl bg-white text-slate-800 shadow-2xl overflow-hidden flex flex-col max-h-[80vh]">
+        <div class="px-6 py-4 border-b border-slate-100 flex items-center justify-between gap-3 shrink-0">
+          <div class="flex items-center gap-2">
+            <span class="w-7 h-7 rounded-lg bg-violet-500/15 text-violet-600 grid place-items-center">
+              <Icon name="spark" class="w-4 h-4" />
+            </span>
+            <h2 class="text-base font-semibold">公告</h2>
+          </div>
+          <button @click="dismissAnnouncement" class="text-slate-400 hover:text-slate-700 transition-colors">
+            <Icon name="close" class="w-5 h-5" />
+          </button>
+        </div>
+        <div class="ann-body px-6 py-5 overflow-y-auto" v-html="html"></div>
+        <div class="px-6 py-4 border-t border-slate-100 flex justify-end shrink-0">
+          <button @click="dismissAnnouncement"
+                  class="rounded-lg bg-slate-900 text-white hover:bg-slate-700 px-5 py-2 text-sm font-medium transition-colors">
+            我知道了
+          </button>
+        </div>
+      </div>
+    </div>
+  </transition>
+</template>
+
+<style scoped>
+.ann-fade-enter-active, .ann-fade-leave-active { transition: opacity 0.2s ease; }
+.ann-fade-enter-from, .ann-fade-leave-to { opacity: 0; }
+
+/* Minimal markdown typography for the announcement body. */
+.ann-body { font-size: 0.9rem; line-height: 1.65; color: rgb(51 65 85); }
+.ann-body :deep(h1) { font-size: 1.25rem; font-weight: 700; margin: 0.6em 0 0.4em; color: rgb(15 23 42); }
+.ann-body :deep(h2) { font-size: 1.1rem; font-weight: 700; margin: 0.6em 0 0.4em; color: rgb(15 23 42); }
+.ann-body :deep(h3) { font-size: 1rem; font-weight: 600; margin: 0.6em 0 0.3em; color: rgb(15 23 42); }
+.ann-body :deep(p) { margin: 0.5em 0; }
+.ann-body :deep(ul), .ann-body :deep(ol) { margin: 0.5em 0; padding-left: 1.4em; }
+.ann-body :deep(ul) { list-style: disc; }
+.ann-body :deep(ol) { list-style: decimal; }
+.ann-body :deep(li) { margin: 0.2em 0; }
+.ann-body :deep(a) { color: rgb(124 58 237); text-decoration: underline; }
+.ann-body :deep(strong) { font-weight: 700; color: rgb(15 23 42); }
+.ann-body :deep(code) { background: rgb(241 245 249); padding: 0.1em 0.35em; border-radius: 0.3rem; font-size: 0.85em; }
+.ann-body :deep(pre) { background: rgb(241 245 249); padding: 0.8em; border-radius: 0.5rem; overflow-x: auto; margin: 0.6em 0; }
+.ann-body :deep(pre code) { background: none; padding: 0; }
+.ann-body :deep(blockquote) { border-left: 3px solid rgb(196 181 253); padding-left: 0.9em; color: rgb(100 116 139); margin: 0.6em 0; }
+.ann-body :deep(hr) { border: none; border-top: 1px solid rgb(226 232 240); margin: 1em 0; }
+.ann-body :deep(img) { max-width: 100%; border-radius: 0.5rem; margin: 0.5em 0; }
+</style>