feat(P10): add Propose type, list page, detail page with accept/reject/reopen + sidebar link

src/components/Sidebar.tsx

@@ -32,6 +32,7 @@ export default function Sidebar({ user, onLogout }: Props) {
   const links = user ? [
     { to: '/', icon: '📊', label: 'Dashboard' },
     { to: '/projects', icon: '📁', label: 'Projects' },
+    { to: '/proposes', icon: '💡', label: 'Proposes' },
     { to: '/notifications', icon: '🔔', label: 'Notifications' + (unreadCount > 0 ? ' (' + unreadCount + ')' : '') },
     { to: '/monitor', icon: '📡', label: 'Monitor' },
     ...(user.is_admin ? [{ to: '/roles', icon: '🔐', label: 'Roles' }] : []),