feat(trigger): add plugin trigger workflow support and refactor trigger system

- Add new workflow plugin trigger service for managing plugin-based triggers
- Implement trigger provider encryption utilities for secure credential storage
- Add custom trigger errors module for better error handling
- Refactor trigger provider and manager classes for improved plugin integration
- Update API endpoints to support plugin trigger workflows
- Add database migration for plugin trigger workflow support

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

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

api/core/plugin/impl/trigger.py

@@ -42,11 +42,10 @@ class PluginTriggerManager(BasePluginClient):
         )
 
         for provider in response:
-            provider.declaration.identity.name = f"{provider.plugin_id}/{provider.declaration.identity.name}"
-
+            provider.declaration.identity.name = str(provider.provider)
             # override the provider name for each trigger to plugin_id/provider_name
             for trigger in provider.declaration.triggers:
-                trigger.identity.provider = provider.declaration.identity.name
+                trigger.identity.provider = str(provider.provider)
 
         return response
 
@@ -59,7 +58,7 @@ class PluginTriggerManager(BasePluginClient):
             data = json_response.get("data")
             if data:
                 for trigger in data.get("declaration", {}).get("triggers", []):
-                    trigger["identity"]["provider"] = provider_id.provider_name
+                    trigger["identity"]["provider"] = str(provider_id)
 
             return json_response
 
@@ -71,11 +70,11 @@ class PluginTriggerManager(BasePluginClient):
             transformer=transformer,
         )
 
-        response.declaration.identity.name = f"{response.plugin_id}/{response.declaration.identity.name}"
+        response.declaration.identity.name = str(provider_id)
 
         # override the provider name for each trigger to plugin_id/provider_name
         for trigger in response.declaration.triggers:
-            trigger.identity.provider = response.declaration.identity.name
+            trigger.identity.provider = str(provider_id)
 
         return response
 
@@ -123,7 +122,7 @@ class PluginTriggerManager(BasePluginClient):
 
     def validate_provider_credentials(
         self, tenant_id: str, user_id: str, provider: str, credentials: Mapping[str, str]
-    ) -> TriggerValidateProviderCredentialsResponse:
+    ) -> bool:
         """
         Validate the credentials of the trigger provider.
         """
@@ -147,9 +146,9 @@ class PluginTriggerManager(BasePluginClient):
         )
 
         for resp in response:
-            return resp
+            return resp.result
 
-        return TriggerValidateProviderCredentialsResponse(valid=False, message="No response", error="No response")
+        raise ValueError("No response received from plugin daemon for validate provider credentials")
 
     def dispatch_event(
         self,