fix(prompt-optimizer): 修复数据模型和业务逻辑问题

- 修复PromptOptimizerSessionHistory模型中session_id外键关系错误
- 统一会话ID的使用逻辑，区分内部ID和外部session_id
- 修复服务层create_update_model_config方法参数不匹配问题
- 优化会话历史查询逻辑，确保正确的数据关联
- 修复消息创建时的会话验证和ID映射问题
- 改进Repository层的类型注解准确性

api/app/services/prompt_optimizer_service.py

@@ -73,7 +73,6 @@ class PromptOptimizerService:
             self,
             tenant_id: uuid.UUID,
             config_id: uuid.UUID,
-            model_id: uuid.UUID,
             system_prompt: str,
     ) -> PromptOptimizerModelConfig:
         """
@@ -86,7 +85,6 @@ class PromptOptimizerService:
         Args:
             tenant_id (uuid.UUID): The unique identifier of the tenant.
             config_id (uuid.UUID): The unique identifier of the configuration to create or update.
-            model_id (uuid.UUID): The unique identifier of the model associated with this configuration.
             system_prompt (str): The system prompt content used for prompt optimization.
 
         Returns: