修复合同编辑：表单值同步+结算方式联动+付款节点从数据库加载

frontend/src/pages/projects/ProjectDetail.tsx

@@ -540,7 +540,41 @@ const ProjectDetail: React.FC = () => {
     const latestContract = contracts.length > 0 ? contracts[0] : null;
     
     return (
-      <Card title="合同详情" extra={<Button icon={<EditOutlined />} onClick={() => setContractEditModalVisible(true)}>合同细节录入</Button>}>
+      <Card title="合同详情" extra={<Button icon={<EditOutlined />} onClick={() => {
+        const latestContract = contracts.length > 0 ? contracts[0] : null;
+        const savedSettlement = latestContract?.settlement_method || 'lump_sum';
+        const savedTotal = parseFloat(latestContract?.contract_amount || project?.contract_amount || '0');
+        setSettlementType(savedSettlement);
+        setContractTotal(savedTotal);
+        setContractFile(latestContract?.contract_file || '');
+        if (milestones.length > 0) {
+          setPaymentNodes(milestones.map((m: any) => ({
+            key: String(m.id),
+            name: m.milestone_name || '',
+            condition: m.condition || '',
+            percentage: m.percentage || 0,
+            amount: m.amount || 0,
+            status: m.status || 'pending'
+          })));
+        } else {
+          setPaymentNodes([
+            { key: '1', name: '预付款', condition: '合同签订后7天内', percentage: 40, amount: Math.round(savedTotal * 0.4), status: 'pending' },
+            { key: '2', name: '进度款', condition: '所有设备材料达到现场', percentage: 30, amount: Math.round(savedTotal * 0.3), status: 'pending' },
+            { key: '3', name: '尾款', condition: '通电完工7天内', percentage: 27, amount: Math.round(savedTotal * 0.27), status: 'pending' },
+            { key: '4', name: '质保金', condition: '', percentage: 3, amount: Math.round(savedTotal * 0.03), status: 'pending' }
+          ]);
+        }
+        setContractEditModalVisible(true);
+        setTimeout(() => {
+          contractForm.setFieldsValue({
+            project_overview: project?.project_situation || project?.description || '',
+            settlement_type: savedSettlement,
+            contract_total: savedTotal,
+            tax_included: latestContract?.tax_included || false,
+            other_info: latestContract?.other_info || ''
+          });
+        }, 100);
+      }}>合同细节录入</Button>}>
         <Descriptions column={2} bordered style={{ marginBottom: 24 }}>
           <Descriptions.Item label="合同金额">
             {project.currency} {parseFloat(latestContract?.contract_amount || project.contract_amount || '0').toLocaleString()}
@@ -1527,11 +1561,12 @@ const ProjectDetail: React.FC = () => {
             }
             
             const values = await contractForm.validateFields();
-            const finalContractTotal = settlementType === 'unit_price' ? contractTotal : (values.contract_total || 0);
+            const actualSettlementType = values.settlement_type || settlementType;
+            const finalContractTotal = actualSettlementType === 'unit_price' ? contractTotal : (values.contract_total || 0);
             const saveData = {
               project_id: id,
               project_overview: values.project_overview,
-              settlement_type: values.settlement_type,
+              settlement_type: actualSettlementType,
               contract_total: finalContractTotal,
               tax_included: values.tax_included || false,
               unit_price_items: unitPriceItems,
@@ -1584,6 +1619,13 @@ const ProjectDetail: React.FC = () => {
                   { value: 'lump_sum', label: '总价包干' },
                   { value: 'unit_price', label: '单价结算' }
                 ]}
+                onChange={(val) => {
+                  setSettlementType(val);
+                  if (val === 'lump_sum') {
+                    const formTotal = contractForm.getFieldValue('contract_total') || 0;
+                    setContractTotal(formTotal);
+                  }
+                }}
               />
             </Form.Item>