feat(api): 添加Ticket和Version模块路由

- 引入TicketRouter和VersionRouter
- 将TicketRouter和VersionRouter加入SYSTEM_MODULES路由列表
- 移除未使用的ResourceRouter导入声明

backend/app/api/v1/module_system/ticket/model.py

@@ -0,0 +1,30 @@
+from sqlalchemy import Column, Integer, String, Text, DateTime, ForeignKey
+from sqlalchemy.orm import relationship
+from app.core.base_model import BaseModel
+from app.api.v1.module_system.user.model import User
+from datetime import datetime
+
+
+class Ticket(BaseModel):
+    """工单模型"""
+    __tablename__ = "ticket"
+    
+    id = Column(Integer, primary_key=True, index=True, comment="工单ID")
+    
+    title = Column(String(255), nullable=False, comment="工单标题")
+    
+    status = Column(String(50), default="open", comment="工单状态(open, in_progress, resolved, closed)")
+    priority = Column(String(50), default="medium", comment="优先级(low, medium, high, urgent)")
+    type = Column(String(50), comment="工单类型(bug, feature, task)")
+    assignee_id = Column(Integer, ForeignKey("system_user.id"), comment="指派给用户ID")
+    reporter_id = Column(Integer, ForeignKey("system_user.id"), comment="报告人ID")
+    project = Column(String(100), comment="所属项目")
+    version = Column(String(50), comment="版本号")
+
+    description = Column(Text, comment="工单描述")
+    created_at = Column(DateTime, default=datetime.now, comment="创建时间")
+    updated_at = Column(DateTime, default=datetime.now, onupdate=datetime.now, comment="更新时间")
+    
+    # 关系
+    assignee = relationship("User", foreign_keys=[assignee_id])
+    reporter = relationship("User", foreign_keys=[reporter_id])