feat(memory-api): implement memory read/write API service endpoints

- Add MemoryAPIService with read_memory and write_memory methods for managing user memories
- Create memory_api_schema.py with request/response schemas for read and write operations
- Implement write_memory_api_service endpoint for storing memory content with configurable storage backends
- Implement read_memory_api_service endpoint for querying memories with context-aware responses
- Add memory-specific error codes (MEMORY_WRITE_FAILED, MEMORY_READ_FAILED, MEMORY_CONFIG_NOT_FOUND) to error_codes.py

api/app/core/error_codes.py

@@ -78,6 +78,11 @@ class BizCode(IntEnum):
     EMBEDDING_FAILED = 9002
     SEARCH_FAILED = 9003
 
+    # Memory API（95xx）
+    MEMORY_WRITE_FAILED = 9501
+    MEMORY_READ_FAILED = 9502
+    MEMORY_CONFIG_NOT_FOUND = 9503
+
     # 系统（100xx）
     INTERNAL_ERROR = 10001
     DB_ERROR = 10002
@@ -148,6 +153,12 @@ HTTP_MAPPING = {
     BizCode.INDEX_BUILD_FAILED: 500,
     BizCode.EMBEDDING_FAILED: 500,
     BizCode.SEARCH_FAILED: 500,
+    
+    # Memory API 错误码映射
+    BizCode.MEMORY_WRITE_FAILED: 500,
+    BizCode.MEMORY_READ_FAILED: 500,
+    BizCode.MEMORY_CONFIG_NOT_FOUND: 400,
+    
     BizCode.INTERNAL_ERROR: 500,
     BizCode.DB_ERROR: 500,
     BizCode.SERVICE_UNAVAILABLE: 503,