feat(enterprise): Add OTEL telemetry with slim traces, metrics, and structured logs

- Add EnterpriseOtelTrace handler with span emission for workflows and nodes
- Implement minimal-span strategy: slim spans + detailed companion logs
- Add deterministic span/trace IDs for cross-workflow trace correlation
- Add metric collection at 100% accuracy (counters & histograms)
- Add event handlers for app lifecycle and feedback telemetry
- Add cross-workflow trace linking with parent context propagation
- Add OTEL exporter with configurable sampling and privacy controls
- Wire enterprise telemetry into workflow execution pipeline
- Add telemetry configuration in enterprise configs

api/services/app_service.py

@@ -14,7 +14,7 @@ from core.model_runtime.entities.model_entities import ModelPropertyKey, ModelTy
 from core.model_runtime.model_providers.__base.large_language_model import LargeLanguageModel
 from core.tools.tool_manager import ToolManager
 from core.tools.utils.configuration import ToolParameterConfigurationManager
-from events.app_event import app_was_created
+from events.app_event import app_was_created, app_was_deleted
 from extensions.ext_database import db
 from libs.datetime_utils import naive_utc_now
 from libs.login import current_user
@@ -340,6 +340,8 @@ class AppService:
         db.session.delete(app)
         db.session.commit()
 
+        app_was_deleted.send(app)
+
         # clean up web app settings
         if FeatureService.get_system_features().webapp_auth.enabled:
             EnterpriseService.WebAppAuth.cleanup_webapp(app.id)