feat: 完善循环节点配置与作用域输出

- 支持次数与数组独立或组合配置并补齐检查规则

- 统一循环体临时变量与下游正式输出候选

- 稳定知识库对象数组字段并补充前后端测试

easyflow-ui-admin/packages/tinyflow-ui/src/utils/workflowNodeFields.test.ts

@@ -367,6 +367,107 @@ describe('workflow node fields', () => {
     expect(contentParameter?.itemTypeLabel).toBe('数组项字段');
   });
 
+  it('exposes typed loop variables only to nodes inside the loop body', () => {
+    const knowledgeNode: Node = {
+      id: 'knowledge_1',
+      type: 'knowledgeNode',
+      position: { x: 0, y: 0 },
+      data: {
+        title: '知识库',
+        outputDefs: [
+          {
+            name: 'documents',
+            dataType: 'Array',
+            children: [
+              { name: 'title', dataType: 'String' },
+              { name: 'content', dataType: 'String' },
+            ],
+          },
+        ],
+      },
+    };
+    const loopNode: Node = {
+      id: 'loop_1',
+      type: 'loopNode',
+      position: { x: 120, y: 0 },
+      data: {
+        title: '循环',
+        loopInputs: {
+          items: {
+            name: 'items',
+            refType: 'ref',
+            ref: 'knowledge_1.documents',
+            dataType: 'Array',
+          },
+        },
+        outputDefs: [
+          {
+            name: 'res',
+            dataType: 'Array<String>',
+          },
+        ],
+      },
+    };
+    const insideNode: Node = {
+      id: 'llm_inside',
+      type: 'llmNode',
+      parentId: 'loop_1',
+      position: { x: 240, y: 0 },
+      data: { title: '循环内模型', parameters: [] },
+    };
+    const outsideNode: Node = {
+      id: 'llm_outside',
+      type: 'llmNode',
+      position: { x: 240, y: 120 },
+      data: { title: '循环外模型', parameters: [] },
+    };
+    const nodes = [
+      knowledgeNode,
+      loopNode,
+      insideNode,
+      outsideNode,
+    ];
+
+    const insideParameters = buildEditorReferenceParameters(
+      'llm_inside',
+      nodes,
+      [],
+      [],
+    );
+    const outsideParameters = buildEditorReferenceParameters(
+      'llm_outside',
+      nodes,
+      [
+        {
+          id: 'loop_to_outside',
+          source: 'loop_1',
+          target: 'llm_outside',
+        },
+      ],
+      [],
+    );
+
+    expect(insideParameters.map((item) => item.name)).toEqual([
+      'loop_1.index',
+      'loop_1.loopItem',
+      'loop_1.loopItem.title',
+      'loop_1.loopItem.content',
+    ]);
+    expect(
+      insideParameters.find(
+        (item) => item.name === 'loop_1.loopItem.content',
+      )?.dataType,
+    ).toBe('String');
+    expect(
+      outsideParameters.map((item) => item.name),
+    ).toEqual(['loop_1.res']);
+    expect(
+      outsideParameters.some((item) =>
+        ['loop_1.index', 'loop_1.loopItem'].includes(item.name || ''),
+      ),
+    ).toBe(false);
+  });
+
   it('uses document node child outputs for reference display', () => {
     const documentNode: Node = {
       id: 'doc_1',