前端进度条性能优化、仿真结束后后处理优化；后端C代码生成流程优化：先识别来源，再按照已知未知量需求排序，最后局部求解

frontend/tests/e2e/fit-view.spec.ts

@@ -490,7 +490,7 @@ test("恢复自动保存工程后自动适配建模画布", async ({ page }) =>
   await expect(consolePanel).toContainText("已恢复上次自动保存的工程");
 });
 
-test("切换到结果页时自动适配只读系统图", async ({ page }) => {
+test("切换到结果页时自动适配只读系统图，旧网格线设置不再生效", async ({ page }) => {
   await prepareApp(page);
   await page.addInitScript(({ project, snapshot }) => {
     window.sessionStorage.setItem(
@@ -513,7 +513,7 @@ test("切换到结果页时自动适配只读系统图", async ({ page }) => {
     page.locator(
       '.flow-canvas .react-flow__background pattern[id$="major-grid-lines"]',
     ),
-  ).toHaveCount(1);
+  ).toHaveCount(0);
   await expect(
     page.locator(
       '.flow-canvas .react-flow__background pattern[id$="minor-grid-dots"]',
@@ -533,7 +533,7 @@ test("切换到结果页时自动适配只读系统图", async ({ page }) => {
     page.locator(
       '.results-system-canvas .react-flow__background pattern[id$="major-grid-lines"]',
     ),
-  ).toHaveCount(1);
+  ).toHaveCount(0);
   await expect(
     page.locator(
       '.results-system-canvas .react-flow__background pattern[id$="minor-grid-dots"]',
@@ -659,8 +659,8 @@ test("切换到结果页时自动适配只读系统图", async ({ page }) => {
     }),
   );
   for (const shape of idleResultPortShapes) {
-    expect(Math.abs(shape.width - 6)).toBeLessThan(0.05);
-    expect(Math.abs(shape.height - 6)).toBeLessThan(0.05);
+    expect(Math.abs(shape.width - 6 * resultViewportZoom)).toBeLessThan(0.05);
+    expect(Math.abs(shape.height - 6 * resultViewportZoom)).toBeLessThan(0.05);
     expect(shape.glyphWidth).not.toBeNull();
     expect(shape.glyphHeight).not.toBeNull();
     expect(