Feature/episodic memory (#64)

* [feature]episodic memory

* [feature]episodic memory

* [changes]AI review and modify code

api/app/schemas/user_memory_schema.py

@@ -0,0 +1,30 @@
+"""
+用户记忆相关的请求和响应模型
+"""
+from pydantic import BaseModel, Field
+from typing import Optional
+
+
+class EpisodicMemoryOverviewRequest(BaseModel):
+    """情景记忆总览查询请求"""
+    
+    end_user_id: str = Field(..., description="终端用户ID")
+    time_range: str = Field(
+        default="all",
+        description="时间范围筛选，可选值：all, today, this_week, this_month"
+    )
+    episodic_type: str = Field(
+        default="all",
+        description="情景类型筛选，可选值：all, conversation, project_work, learning, decision, important_event"
+    )
+    title_keyword: Optional[str] = Field(
+        default=None,
+        description="标题关键词，用于模糊搜索（可选）"
+    )
+
+
+class EpisodicMemoryDetailsRequest(BaseModel):
+    """情景记忆详情查询请求"""
+    
+    end_user_id: str = Field(..., description="终端用户ID")
+    summary_id: str = Field(..., description="情景记忆摘要ID")