refactor(web): replace all hardcoded SVG icons with lucide-react

Unify icon usage across the entire frontend by replacing 67 hardcoded
SVG icons with lucide-react components across ~25 files. This improves
consistency, maintainability, and reduces bundle duplication.

Key replacements:
- Sidebar nav: Zap, LayoutDashboard, Bot, Workflow, BookMarked, etc.
- MCP forms: Loader2, XCircle, Trash2
- Monitoring: Sparkles, MessageSquare, CheckCircle2, RefreshCw, etc.
- Cards: Clock, Star, Workflow, Hexagon, Puzzle, Github, etc.
- Misc: Paperclip, AudioLines, CloudUpload, Layers, Heart, Smile

Zero hardcoded <svg> tags remain in .tsx files.

web/src/app/home/monitoring/components/FeedbackCard.tsx

@@ -6,6 +6,8 @@ import {
   TrendingUp,
   TrendingDown,
   Minus,
+  Heart,
+  Smile,
 } from 'lucide-react';
 
 interface FeedbackCardProps {
@@ -133,11 +135,7 @@ export function FeedbackStatsCards({ stats, loading }: FeedbackStatsProps) {
     {
       title: t('monitoring.feedback.totalFeedback'),
       value: stats?.totalFeedback ?? 0,
-      icon: (
-        <svg className="w-6 h-6" viewBox="0 0 24 24" fill="currentColor">
-          <path d="M12 21.35l-1.45-1.32C5.4 15.36 2 12.28 2 8.5 2 5.42 4.42 3 7.5 3c1.74 0 3.41.81 4.5 2.09C13.09 3.81 14.76 3 16.5 3 19.58 3 22 5.42 22 8.5c0 3.78-3.4 6.86-8.55 11.54L12 21.35z" />
-        </svg>
-      ),
+      icon: <Heart className="w-6 h-6" />,
       variant: 'default' as const,
     },
     {
@@ -155,11 +153,7 @@ export function FeedbackStatsCards({ stats, loading }: FeedbackStatsProps) {
     {
       title: t('monitoring.feedback.satisfactionRate'),
       value: stats ? `${stats.satisfactionRate}%` : '0%',
-      icon: (
-        <svg className="w-6 h-6" viewBox="0 0 24 24" fill="currentColor">
-          <path d="M11.99 2C6.47 2 2 6.48 2 12s4.47 10 9.99 10C17.52 22 22 17.52 22 12S17.52 2 11.99 2zM12 20c-4.42 0-8-3.58-8-8s3.58-8 8-8 8 3.58 8 8-3.58 8-8 8zm3.5-9c.83 0 1.5-.67 1.5-1.5S16.33 8 15.5 8 14 8.67 14 9.5s.67 1.5 1.5 1.5zm-7 0c.83 0 1.5-.67 1.5-1.5S9.33 8 8.5 8 7 8.67 7 9.5 7.67 11 8.5 11zm3.5 6.5c2.33 0 4.31-1.46 5.11-3.5H6.89c.8 2.04 2.78 3.5 5.11 3.5z" />
-        </svg>
-      ),
+      icon: <Smile className="w-6 h-6" />,
       variant: (stats && stats.satisfactionRate >= 80
         ? 'success'
         : stats && stats.satisfactionRate >= 50