修复完美像素对账请求的绝对截止

为 requestJson 增加覆盖鉴权、重试和响应体读取的可选绝对 deadline。

让完美像素项目对账按 75 秒窗口和单次 10 秒上界读取权威快照。

补充鉴权等待、响应体读取、客户端透传和对账边界的定向测试与文档。

src/components/image-editor/useImageCanvasGenerationWorkflow.ts

@@ -391,17 +391,18 @@ async function reconcilePerfectPixelProject(
     }
     try {
       hasAttemptedRead = true;
+      const readStartedAt = Date.now();
+      const remainingAtReadMs = operation.reconcileUntil - readStartedAt;
+      const readDeadlineAt =
+        remainingAtReadMs > 0
+          ? Math.min(
+              operation.reconcileUntil,
+              readStartedAt + PERFECT_PIXEL_PROJECT_READ_TIMEOUT_MS,
+            )
+          : readStartedAt + PERFECT_PIXEL_PROJECT_READ_TIMEOUT_MS;
       latestProject = await loadEditorProject(projectId, {
         signal: options.signal,
-        timeoutMs: Math.max(
-          1,
-          Math.min(
-            PERFECT_PIXEL_PROJECT_READ_TIMEOUT_MS,
-            remainingAfterDelayMs > 0
-              ? remainingAfterDelayMs
-              : PERFECT_PIXEL_PROJECT_READ_TIMEOUT_MS,
-          ),
-        ),
+        deadlineAt: readDeadlineAt,
       });
       const verdict = inspectPerfectPixelProjectSnapshot(
         latestProject,