feat: 代码生成新增字段唯一性配置

ruoyi-fastapi-backend/module_generator/templates/python/do.py.jinja2

@@ -15,7 +15,7 @@ class {{ ClassName }}(Base):
     __tablename__ = '{{ tableName }}'
 
     {% for column in columns %}
-    {{ column.column_name }} = Column({{ column.column_type | get_sqlalchemy_type }}, {% if column.pk %}primary_key=True, {% endif %}{% if column.increment %}autoincrement=True, {% endif %}{% if column.required %}nullable=True{% else %}nullable=False{% endif %}, comment='{{ column.column_comment }}')
+    {{ column.column_name }} = Column({{ column.column_type | get_sqlalchemy_type }}, {% if column.pk %}primary_key=True, {% endif %}{% if column.increment %}autoincrement=True, {% endif %}{% if column.required or column.pk %}nullable=False{% else %}nullable=True{% endif %}, comment='{{ column.column_comment }}')
     {% endfor %}
 
     {% if table.sub %}