feat(plugin): PluginField 扩展 — ref_entity / validation / no_cycle

新增 FieldValidation 类型支持正则校验规则，PluginField 增加
ref_entity（外键引用实体名）、validation（字段校验规则）、
no_cycle（禁止循环引用）三个可选字段。

crates/erp-plugin/src/manifest.rs

@@ -45,6 +45,13 @@ pub struct PluginEntity {
     pub indexes: Vec<PluginIndex>,
 }
 
+/// 字段校验规则
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct FieldValidation {
+    pub pattern: Option<String>,   // 正则表达式
+    pub message: Option<String>,   // 校验失败提示
+}
+
 /// 插件字段定义
 #[derive(Debug, Clone, Serialize, Deserialize)]
 pub struct PluginField {
@@ -66,6 +73,10 @@ pub struct PluginField {
     pub sortable: Option<bool>,
     #[serde(default)]
     pub visible_when: Option<String>,
+    pub ref_entity: Option<String>,           // 外键引用的实体名
+    pub validation: Option<FieldValidation>,  // 字段校验规则
+    #[serde(default)]
+    pub no_cycle: Option<bool>,               // 禁止循环引用
 }
 
 /// 字段类型
@@ -129,6 +140,9 @@ impl PluginField {
             filterable: None,
             sortable: None,
             visible_when: None,
+            ref_entity: None,
+            validation: None,
+            no_cycle: None,
         }
     }
 }
@@ -599,4 +613,81 @@ label = "空标签页"
         assert_eq!(PluginFieldType::Integer.generated_expr("age"), "(data->>'age')::INTEGER");
         assert_eq!(PluginFieldType::Uuid.generated_expr("ref_id"), "(data->>'ref_id')::UUID");
     }
+
+    #[test]
+    fn parse_field_with_ref_entity() {
+        let toml = r#"
+[metadata]
+id = "test"
+name = "Test"
+version = "0.1.0"
+
+[schema]
+[[schema.entities]]
+name = "contact"
+display_name = "联系人"
+
+[[schema.entities.fields]]
+name = "customer_id"
+field_type = "uuid"
+required = true
+display_name = "所属客户"
+ref_entity = "customer"
+"#;
+        let manifest = parse_manifest(toml).unwrap();
+        let field = &manifest.schema.unwrap().entities[0].fields[0];
+        assert_eq!(field.ref_entity.as_deref(), Some("customer"));
+    }
+
+    #[test]
+    fn parse_field_with_validation() {
+        let toml = r#"
+[metadata]
+id = "test"
+name = "Test"
+version = "0.1.0"
+
+[schema]
+[[schema.entities]]
+name = "contact"
+display_name = "联系人"
+
+[[schema.entities.fields]]
+name = "phone"
+field_type = "string"
+display_name = "手机号"
+validation = { pattern = "^1[3-9]\\d{9}$", message = "手机号格式不正确" }
+"#;
+        let manifest = parse_manifest(toml).unwrap();
+        let field = &manifest.schema.unwrap().entities[0].fields[0];
+        let v = field.validation.as_ref().unwrap();
+        assert_eq!(v.pattern.as_deref(), Some("^1[3-9]\\d{9}$"));
+        assert_eq!(v.message.as_deref(), Some("手机号格式不正确"));
+    }
+
+    #[test]
+    fn parse_field_with_no_cycle() {
+        let toml = r#"
+[metadata]
+id = "test"
+name = "Test"
+version = "0.1.0"
+
+[schema]
+[[schema.entities]]
+name = "customer"
+display_name = "客户"
+
+[[schema.entities.fields]]
+name = "parent_id"
+field_type = "uuid"
+display_name = "上级客户"
+ref_entity = "customer"
+no_cycle = true
+"#;
+        let manifest = parse_manifest(toml).unwrap();
+        let field = &manifest.schema.unwrap().entities[0].fields[0];
+        assert_eq!(field.no_cycle, Some(true));
+        assert_eq!(field.ref_entity.as_deref(), Some("customer"));
+    }
 }