feat(feedback): 反馈 FAB 菜单加「反馈管理」入口，BI-ADMIN-FEEDBACK 角色可见

- shared/auth/roles 新增 FEEDBACK_ADMIN_ROLES = ['BI-ADMIN-FEEDBACK']
  + canManageFeedback() helper（含 FULL_ACCESS_ROLES 兜底）
- FeedbackFab 菜单：在「我的反馈」下方加分割线 + 紫色 ⚙ 图标的「反馈管理」
  仅 canManageFeedback 为 true 时渲染，跳到 #/admin/feedback
- 后端守卫：GET /api/feedback/list 与 PATCH /api/feedback/:id 加角色判断
  无权限返回 403。/mine /submit /upload 仍对全部登录用户开放。

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/components/FeedbackFab.tsx

@@ -2,10 +2,12 @@ import { useEffect, useRef, useState } from 'react';
 import { motion, AnimatePresence } from 'motion/react';
 import {
   MessageCircleHeart, X, ChevronRight, ChevronLeft, Check, Sparkles,
-  ImagePlus, Loader2, Inbox, Lightbulb, Bug, Palette, NotebookPen,
+  ImagePlus, Loader2, Inbox, Lightbulb, Bug, Palette, NotebookPen, Settings2,
   type LucideIcon,
 } from 'lucide-react';
 import { fetchJson } from '../auth/api-client';
+import { useAuth } from '../auth/useAuth';
+import { canManageFeedback } from '../shared/auth/roles';
 import FeedbackHistoryDrawer from './FeedbackHistoryDrawer';
 
 const MAX_SCREENSHOTS = 6;
@@ -86,6 +88,8 @@ interface Props {
 }
 
 export default function FeedbackFab({ module: moduleProp }: Props = {}) {
+  const { user } = useAuth();
+  const isAdmin = canManageFeedback(user?.roles);
   const [open, setOpen] = useState(false);
   const [historyOpen, setHistoryOpen] = useState(false);
   const [menuOpen, setMenuOpen] = useState(false);
@@ -229,6 +233,18 @@ export default function FeedbackFab({ module: moduleProp }: Props = {}) {
               >
                 <Inbox size={14} className="text-emerald-500" /> 我的反馈
               </button>
+              {isAdmin && (
+                <>
+                  <div className="h-px bg-slate-100 my-0.5" />
+                  <a
+                    href="#/admin/feedback"
+                    onClick={() => setMenuOpen(false)}
+                    className="flex items-center gap-2 px-3 py-2 text-[12px] font-bold text-slate-700 rounded-lg hover:bg-violet-50 hover:text-violet-600"
+                  >
+                    <Settings2 size={14} className="text-violet-500" /> 反馈管理
+                  </a>
+                </>
+              )}
             </motion.div>
           )}
         </AnimatePresence>