feat: unified catalog endpoint and slug-based app navigation

Consolidate route catalog (agent-driven) and apps table (deployment-
driven) into a single GET /api/v1/catalog?environment={slug} endpoint.
Apps table is authoritative; agent data enriches with live health,
routes, and metrics. Unmanaged apps (agents without App record) appear
with managed=false.

- Add CatalogController merging App records + agent registry + ClickHouse
- Add CatalogApp DTO with deployment summary, managed flag, health
- Change AppController and DeploymentController to accept slugs (not UUIDs)
- Add AppRepository.findBySlug() and AppService.getBySlug()
- Replace useRouteCatalog() with useCatalog() across all UI components
- Navigate to /apps/{slug} instead of /apps/{UUID}
- Update sidebar, search, and all catalog lookups to use slug

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

cameleer3-server-core/src/main/java/com/cameleer3/server/core/runtime/AppRepository.java

@@ -10,6 +10,7 @@ public interface AppRepository {
     List<App> findAll();
     Optional<App> findById(UUID id);
     Optional<App> findByEnvironmentIdAndSlug(UUID environmentId, String slug);
+    Optional<App> findBySlug(String slug);
     UUID create(UUID environmentId, String slug, String displayName);
     void updateContainerConfig(UUID id, Map<String, Object> containerConfig);
     void delete(UUID id);

cameleer3-server-core/src/main/java/com/cameleer3/server/core/runtime/AppService.java

@@ -29,6 +29,7 @@ public class AppService {
     public List<App> listAll() { return appRepo.findAll(); }
     public List<App> listByEnvironment(UUID environmentId) { return appRepo.findByEnvironmentId(environmentId); }
     public App getById(UUID id) { return appRepo.findById(id).orElseThrow(() -> new IllegalArgumentException("App not found: " + id)); }
+    public App getBySlug(String slug) { return appRepo.findBySlug(slug).orElseThrow(() -> new IllegalArgumentException("App not found: " + slug)); }
     public List<AppVersion> listVersions(UUID appId) { return versionRepo.findByAppId(appId); }
 
     public void updateContainerConfig(UUID id, Map<String, Object> containerConfig) {