feat: AI套图分层方案 + Gemini集成 - 4种图案类型处理 + 正片叠底 + 宽高比 + 模型选择

Co-authored-by: Cursor <cursoragent@cursor.com>

Server/app/models/chat.py

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+"""
+AI 对话模型
+- ChatSession: 对话会话（按用户隔离）
+- ChatMessage: 对话消息
+"""
+from sqlalchemy import Column, Integer, String, DateTime, Text, ForeignKey, func
+from app.db import Base
+
+
+class ChatSession(Base):
+    """对话会话表 — 每个用户可以有多个对话"""
+    __tablename__ = "chat_sessions"
+
+    id = Column(Integer, primary_key=True, index=True)
+    user_id = Column(Integer, ForeignKey("users.id"), nullable=False, index=True)
+    username = Column(String(64), nullable=False, index=True)
+    title = Column(String(200), default="新对话")       # 对话标题（取首条消息摘要）
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+    updated_at = Column(DateTime(timezone=True), server_default=func.now(), onupdate=func.now())
+
+
+class ChatMessage(Base):
+    """对话消息表"""
+    __tablename__ = "chat_messages"
+
+    id = Column(Integer, primary_key=True, index=True)
+    session_id = Column(Integer, ForeignKey("chat_sessions.id", ondelete="CASCADE"), nullable=False, index=True)
+    role = Column(String(20), nullable=False)             # user / assistant / system
+    content = Column(Text, nullable=False)                # 消息内容
+    tool_calls = Column(Text, nullable=True)              # 工具调用 JSON（预留）
+    created_at = Column(DateTime(timezone=True), server_default=func.now())

Server/app/models/logs.py

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+# -*- coding: utf-8 -*-
+"""
+PLT处理记录和用户操作日志模型
+"""
+
+from sqlalchemy import Column, Integer, String, DateTime, func, ForeignKey, Text, JSON, Float
+from sqlalchemy.orm import relationship
+from app.db import Base
+
+
+class PltProcessRecord(Base):
+    """PLT处理记录表"""
+    __tablename__ = "plt_process_records"
+    
+    id = Column(Integer, primary_key=True, index=True)
+    user_id = Column(Integer, ForeignKey("users.id"), nullable=False, index=True)
+    
+    # 文件信息
+    filename = Column(String(255), nullable=True)
+    file_size = Column(Integer, nullable=True)  # 字节
+    rotated_filename = Column(String(255), nullable=True)  # 旋转对比文件名
+    
+    # 处理参数
+    size_labels = Column(JSON, nullable=True)  # ["S", "M", "L", ...]
+    dpi = Column(Integer, default=150)
+    rotation = Column(Integer, default=0)
+    
+    # 处理结果
+    total_groups = Column(Integer, default=0)  # 裁片组数
+    total_pieces = Column(Integer, default=0)  # 裁片总数
+    process_time_ms = Column(Integer, nullable=True)  # 处理耗时(毫秒)
+    
+    # 状态
+    status = Column(String(20), default='success')  # success, error
+    error_message = Column(Text, nullable=True)
+    
+    created_at = Column(DateTime(timezone=True), server_default=func.now(), nullable=False)
+    
+    # 关联
+    user = relationship("User", backref="plt_records")
+    pieces = relationship("PltPiece", back_populates="record", cascade="all, delete-orphan")
+
+
+class PltPiece(Base):
+    """PLT裁片详情表"""
+    __tablename__ = "plt_pieces"
+    
+    id = Column(Integer, primary_key=True, index=True)
+    record_id = Column(Integer, ForeignKey("plt_process_records.id", ondelete="CASCADE"), nullable=False, index=True)
+    
+    # 裁片信息
+    group_id = Column(Integer, nullable=False)  # 组号
+    size = Column(String(20), nullable=False)   # 尺码
+    image_url = Column(String(500), nullable=True)  # 七牛云 URL
+    
+    # 尺寸信息
+    width_px = Column(Integer, default=0)
+    height_px = Column(Integer, default=0)
+    width_cm = Column(Float, default=0)
+    height_cm = Column(Float, default=0)
+    left_cm = Column(Float, default=0)
+    top_cm = Column(Float, default=0)
+    center_x_cm = Column(Float, default=0)
+    center_y_cm = Column(Float, default=0)
+    
+    # 关联
+    record = relationship("PltProcessRecord", back_populates="pieces")
+
+
+class UserActionLog(Base):
+    """用户操作日志表"""
+    __tablename__ = "user_action_logs"
+    
+    id = Column(Integer, primary_key=True, index=True)
+    user_id = Column(Integer, ForeignKey("users.id"), nullable=False, index=True)
+    
+    # 会话追踪
+    session_id = Column(String(64), nullable=True, index=True)
+    
+    # 操作信息
+    action_type = Column(String(50), nullable=False, index=True)  # plt.upload, plt.process, etc.
+    action_params = Column(JSON, nullable=True)  # 操作参数
+    page = Column(String(50), nullable=True)  # 所在页面
+    
+    # 结果
+    result = Column(String(20), default='success')  # success, error
+    error_message = Column(Text, nullable=True)
+    
+    # 时间
+    duration_ms = Column(Integer, nullable=True)  # 操作耗时
+    created_at = Column(DateTime(timezone=True), server_default=func.now(), nullable=False)
+    
+    # 关联
+    user = relationship("User", backref="action_logs")