feat: add configurable role/permission system

app/models/models.py

@@ -2,6 +2,7 @@ from sqlalchemy import Column, Integer, String, Text, DateTime, ForeignKey, Enum
 from sqlalchemy.orm import relationship
 from sqlalchemy.sql import func
 from app.core.config import Base
+from app.models.role_permission import Role
 import enum
 
 
@@ -131,7 +132,8 @@ class ProjectMember(Base):
     id = Column(Integer, primary_key=True, index=True)
     project_id = Column(Integer, ForeignKey("projects.id"), nullable=False)
     user_id = Column(Integer, ForeignKey("users.id"), nullable=False)
-    role = Column(String(20), default="dev")  # admin, dev, mgr, ops
+    role_id = Column(Integer, ForeignKey("roles.id"), nullable=False)
+    role = relationship("Role")
     
     project = relationship("Project", back_populates="members")
     user = relationship("User", back_populates="project_memberships")