修复合同编辑：结算方式和合同总价可编辑

frontend/src/pages/projects/ProjectDetail.tsx

@@ -1584,7 +1584,6 @@ const ProjectDetail: React.FC = () => {
                   { value: 'lump_sum', label: '总价包干' },
                   { value: 'unit_price', label: '单价结算' }
                 ]}
-                disabled
               />
             </Form.Item>
 
@@ -1600,7 +1599,6 @@ const ProjectDetail: React.FC = () => {
                   placeholder="请输入合同总价" 
                   formatter={(value) => `¥ ${value}`}
                   parser={(value) => value?.replace(/¥\s?/, '')}
-                  disabled
                 />
               </Form.Item>
             )}
@@ -1612,7 +1610,6 @@ const ProjectDetail: React.FC = () => {
               >
                 <InputNumber 
                   min={0} 
-                  disabled
                 />
               </Form.Item>
             )}