feat(gui): add discovery triage, network scan management, and approval workflow pages (M24)

Three new GUI surfaces closing the backend-to-frontend gap for V2:

- Discovery triage page: summary stats bar, DataTable with claim/dismiss
  actions, status/agent filters, collapsible scan history panel
- Network scan target management: CRUD with create modal, enable/disable
  toggle, Scan Now button, last scan results display
- Jobs page approval workflow: Approve/Reject buttons for AwaitingApproval
  jobs, rejection reason modal, pending approval banner with count,
  AwaitingApproval/AwaitingCSR added to status filter dropdown

Also adds 13 new frontend tests, 4 API types, 12 API client functions,
2 sidebar nav items, 2 routes, and discovery status badge styles.

Docs updated: README, architecture, quickstart, demo-advanced, CLAUDE.md,
roadmap. Version bumped to v2.0.4.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

web/src/components/Layout.tsx

@@ -16,6 +16,8 @@ const nav = [
   { to: '/owners',        label: 'Owners',        icon: 'M16 7a4 4 0 11-8 0 4 4 0 018 0zM12 14a7 7 0 00-7 7h14a7 7 0 00-7-7z' },
   { to: '/teams',         label: 'Teams',         icon: 'M17 20h5v-2a3 3 0 00-5.356-1.857M17 20H7m10 0v-2c0-.656-.126-1.283-.356-1.857M7 20H2v-2a3 3 0 015.356-1.857M7 20v-2c0-.656.126-1.283.356-1.857m0 0a5.002 5.002 0 019.288 0M15 7a3 3 0 11-6 0 3 3 0 016 0zm6 3a2 2 0 11-4 0 2 2 0 014 0zM7 10a2 2 0 11-4 0 2 2 0 014 0z' },
   { to: '/agent-groups',  label: 'Agent Groups',  icon: 'M19 11H5m14 0a2 2 0 012 2v6a2 2 0 01-2 2H5a2 2 0 01-2-2v-6a2 2 0 012-2m14 0V9a2 2 0 00-2-2M5 11V9a2 2 0 012-2m0 0V5a2 2 0 012-2h6a2 2 0 012 2v2M7 7h10 M9 3v2m6-2v2' },
+  { to: '/discovery',     label: 'Discovery',       icon: 'M21 21l-6-6m2-5a7 7 0 11-14 0 7 7 0 0114 0z' },
+  { to: '/network-scans', label: 'Network Scans',  icon: 'M3.055 11H5a2 2 0 012 2v1a2 2 0 002 2 2 2 0 012 2v2.945M8 3.935V5.5A2.5 2.5 0 0010.5 8h.5a2 2 0 012 2 2 2 0 104 0 2 2 0 012-2h1.064M15 20.488V18a2 2 0 012-2h3.064M21 12a9 9 0 11-18 0 9 9 0 0118 0z M9 12l2 2 4-4' },
   { to: '/short-lived',   label: 'Short-Lived',    icon: 'M13 10V3L4 14h7v7l9-11h-7z' },
   { to: '/audit',         label: 'Audit Trail',   icon: 'M12 8v4l3 3m6-3a9 9 0 11-18 0 9 9 0 0118 0z' },
 ];
@@ -67,7 +69,7 @@ export default function Layout() {
         </nav>
 
         <div className="px-5 py-3 border-t border-white/10 flex items-center justify-between">
-          <span className="text-[10px] text-brand-300/60 font-mono">v2.0.3</span>
+          <span className="text-[10px] text-brand-300/60 font-mono">v2.0.4</span>
           {authRequired && (
             <button
               onClick={logout}

web/src/components/StatusBadge.tsx

@@ -19,6 +19,10 @@ const statusStyles: Record<string, string> = {
   Online:              'badge-success',
   Offline:             'badge-danger',
   Stale:               'badge-warning',
+  // Discovery statuses
+  Unmanaged:           'badge-warning',
+  Managed:             'badge-success',
+  Dismissed:           'badge-neutral',
   // Notification statuses
   sent:                'badge-success',
   pending:             'badge-warning',