Fix PostgREST misclassification and empty Domains section

- Replace substring matching with exact base image name comparison in isDatabaseImage() to prevent false positives (postgres no longer matches postgrest)
- Add 'timescaledb' and 'timescaledb-ha' to DATABASE_DOCKER_IMAGES constants for proper namespace handling
- Add empty state messaging when no applications are defined in Docker Compose configuration
- Maintain backward compatibility with all existing database patterns

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

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

bootstrap/helpers/constants.php

@@ -48,6 +48,8 @@ const DATABASE_DOCKER_IMAGES = [
     'influxdb',
     'clickhouse/clickhouse-server',
     'timescaledb/timescaledb',
+    'timescaledb',  // Matches timescale/timescaledb
+    'timescaledb-ha',  // Matches timescale/timescaledb-ha
     'pgvector/pgvector',
 ];
 const SPECIFIC_SERVICES = [