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-app/src/main/java/com/cameleer3/server/app/storage/PostgresDeploymentRepository.java

@@ -107,6 +107,12 @@ public class PostgresDeploymentRepository implements DeploymentRepository {
         jdbc.update("UPDATE deployments SET deployment_strategy = ? WHERE id = ?", strategy, id);
     }
 
+    @Override
+    public void deleteTerminalByAppAndEnvironment(UUID appId, UUID environmentId) {
+        jdbc.update("DELETE FROM deployments WHERE app_id = ? AND environment_id = ? AND status IN ('STOPPED', 'FAILED')",
+                appId, environmentId);
+    }
+
     public Optional<Deployment> findByContainerId(String containerId) {
         var results = jdbc.query(
                 "SELECT " + SELECT_COLS + " FROM deployments WHERE replica_states::text LIKE ? " +