fix: improve deployment progress UI and prevent duplicate deployment rows

- Redesign DeploymentProgress component: track-based layout with amber
  brand color, checkmarks for completed steps, user-friendly labels
  (Prepare, Image, Network, Launch, Verify, Activate, Live)
- Delete terminal (STOPPED/FAILED) deployments before creating new ones
  for the same app+environment, preventing duplicate rows in the UI
- Update CLAUDE.md with comprehensive key class locations, correct deploy
  stages, database migration reference, and REST endpoint summary

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

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

@@ -13,4 +13,5 @@ public interface DeploymentRepository {
     void updateStatus(UUID id, DeploymentStatus status, String containerId, String errorMessage);
     void markDeployed(UUID id);
     void markStopped(UUID id);
+    void deleteTerminalByAppAndEnvironment(UUID appId, UUID environmentId);
 }

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

@@ -28,6 +28,7 @@ public class DeploymentService {
         Environment env = envService.getById(environmentId);
         String containerName = env.slug() + "-" + app.slug();
 
+        deployRepo.deleteTerminalByAppAndEnvironment(appId, environmentId);
         UUID deploymentId = deployRepo.create(appId, appVersionId, environmentId, containerName);
         return deployRepo.findById(deploymentId).orElseThrow();
     }