feature: 新增小说封面图片生成功能

backend/app/models/settings.py

@@ -1,5 +1,5 @@
 """设置数据模型"""
-from sqlalchemy import Column, String, Text, Float, Integer, DateTime, Index
+from sqlalchemy import Column, String, Text, Float, Integer, DateTime, Boolean, Index
 from sqlalchemy.sql import func
 from app.database import Base
 import uuid
@@ -18,6 +18,14 @@ class Settings(Base):
     temperature = Column(Float, default=0.7, comment="温度参数")
     max_tokens = Column(Integer, default=2000, comment="最大token数")
     system_prompt = Column(Text, comment="系统级别提示词，每次AI调用都会使用")
+
+    # 封面图片生成配置
+    cover_api_provider = Column(String(50), comment="封面图片API提供商")
+    cover_api_key = Column(String(500), comment="封面图片API密钥")
+    cover_api_base_url = Column(String(500), comment="封面图片自定义API地址")
+    cover_image_model = Column(String(100), comment="封面图片模型名称")
+    cover_enabled = Column(Boolean, default=False, server_default="0", nullable=False, comment="是否启用封面图片生成")
+
     preferences = Column(Text, comment="其他偏好设置(JSON)")
     created_at = Column(DateTime, server_default=func.now(), comment="创建时间")
     updated_at = Column(DateTime, server_default=func.now(), onupdate=func.now(), comment="更新时间")
@@ -27,4 +35,4 @@ class Settings(Base):
     )
     
     def __repr__(self):
-        return f"<Settings(id={self.id}, user_id={self.user_id}, api_provider={self.api_provider})>"
+        return f"<Settings(id={self.id}, user_id={self.user_id}, api_provider={self.api_provider})>"