feat(trigger): implement complete OAuth authorization flow for trigger providers

- Add OAuth authorization URL generation API endpoint
- Implement OAuth callback handler for credential storage
- Support both system-level and tenant-level OAuth clients
- Add trigger provider credential encryption utilities
- Refactor trigger entities into separate modules
- Update trigger provider service with OAuth client management
- Add credential cache for trigger providers

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

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

api/core/tools/utils/encryption.py

@@ -122,7 +122,6 @@ class ProviderConfigEncrypter:
         self.provider_config_cache.set(data)
         return data
 
-
 def create_provider_encrypter(tenant_id: str, config: list[BasicProviderConfig], cache: ProviderConfigCache):
     return ProviderConfigEncrypter(tenant_id=tenant_id, config=config, provider_config_cache=cache), cache