feat: Go backend, enhanced search, new widgets, Docker deploy

Major changes:
- Add Go backend (backend/) with microservices architecture
- Enhanced master-agents-svc: reranker, content-classifier, stealth-crawler,
  proxy-manager, media-search, fastClassifier, language detection
- New web-svc widgets: KnowledgeCard, ProductCard, ProfileCard, VideoCard,
  UnifiedCard, CardGallery, InlineImageGallery, SourcesPanel, RelatedQuestions
- Improved discover-svc with discover-db integration
- Docker deployment improvements (Caddyfile, vendor.sh, BUILD.md)
- Library-svc: project_id schema migration
- Remove deprecated finance-svc and travel-svc
- Localization improvements across services

Made-with: Cursor

services/web-svc/src/components/Sidebar.tsx

@@ -4,10 +4,10 @@ import { cn } from '@/lib/utils';
 import {
   MessagesSquare,
   Plus,
-  Search,
+  Newspaper,
   TrendingUp,
   Plane,
-  FolderOpen,
+  LayoutPanelLeft,
   User,
   Stethoscope,
   Building2,
@@ -279,7 +279,7 @@ const Sidebar = ({ children }: { children: React.ReactNode }) => {
   }, []);
 
   const discoverLink = {
-    icon: Search,
+    icon: Newspaper,
     href: '/discover',
     active: segments.includes('discover'),
     label: t('nav.discover'),
@@ -307,7 +307,7 @@ const Sidebar = ({ children }: { children: React.ReactNode }) => {
   };
 
   const spacesLink = {
-    icon: FolderOpen,
+    icon: LayoutPanelLeft,
     href: '/spaces',
     active: segments.includes('spaces'),
     label: t('nav.spaces'),