feat: Implement compliance scanning UI flow

- Update /scans page to navigate to compliance flow
- Create ComplianceScans component with 3-step wizard
- Add stepper navigation: Select Target → Choose Rules → Review & Start
- Implement host selection with online/offline status
- Add compliance rules selection with framework/severity filters
- Support both individual hosts and host groups targeting
- Add route /scans/compliance to App.tsx
- Match UI design from container screenshots

🤖 Generated with [Claude Code](https://claude.ai/code)

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

Author: remyluslosius

frontend/src/App.tsx

@@ -18,6 +18,7 @@ import AddHost from './pages/hosts/AddHost';
 import ComplianceGroups from './pages/host-groups/ComplianceGroups';
 import Content from './pages/content/Content';
 import Scans from './pages/scans/Scans';
+import ComplianceScans from './pages/scans/ComplianceScans';
 import ScanDetail from './pages/scans/ScanDetail';
 import NewScan from './pages/scans/NewScan';
 import NewScapScan from './pages/scans/NewScapScan';
@@ -72,6 +73,7 @@ function App() {
                 <Route path="/host-groups" element={<ComplianceGroups />} />
                 <Route path="/content" element={<Content />} />
                 <Route path="/scans" element={<Scans />} />
+                <Route path="/scans/compliance" element={<ComplianceScans />} />
                 <Route path="/scans/new" element={<NewScan />} />
                 <Route path="/scans/new-scap" element={<NewScapScan />} />
                 <Route path="/scans/:id" element={<ScanDetail />} />