Align provider selection and abort observation

Share one pure provider selection plan between real unrestrict routing and cooldown projection, including direct 1Fichier and DDownload paths, disabled Mega aliases, and the secondary-provider exception used when Real-Debrid is cooling down. Attach terminal observers to raw serialized web jobs before evaluating already-aborted signals so late rejections stay handled while the queue remains available. Add RED-to-GREEN regressions for each provider-selection counterexample and pre-aborted Real-Debrid, AllDebrid, and BestDebrid jobs.

tests/alldebrid-web.test.ts

@@ -181,6 +181,33 @@ describe("alldebrid-web", () => {
     await Promise.resolve();
   });
 
+  it("observes the raw rejection when the signal is already aborted and keeps the queue usable", async () => {
+    mockFetch.mockResolvedValue(new Response(JSON.stringify({
+      link: "https://alldebrid.direct/next.bin",
+      filename: "next.bin",
+      filesize: 666
+    }), { status: 200 }));
+    const fallback = new AllDebridWebFallback(() => true);
+    const controller = new AbortController();
+    controller.abort("before-queue");
+    const unhandled: unknown[] = [];
+    const onUnhandled = (reason: unknown) => unhandled.push(reason);
+    process.on("unhandledRejection", onUnhandled);
+    try {
+      await expect(fallback.unrestrict("https://rapidgator.net/file/pre-aborted", controller.signal))
+        .rejects.toThrow("aborted:alldebrid-web");
+      await new Promise((resolve) => setImmediate(resolve));
+      await expect(fallback.unrestrict("https://rapidgator.net/file/next")).resolves.toMatchObject({
+        directUrl: "https://alldebrid.direct/next.bin",
+        fileName: "next.bin"
+      });
+      expect(unhandled).toEqual([]);
+      expect(mockFetch).toHaveBeenCalledTimes(1);
+    } finally {
+      process.off("unhandledRejection", onUnhandled);
+    }
+  });
+
   it("opens the login window after login_required and retries generation with the same session partition", async () => {
     mockFetch
       .mockResolvedValueOnce(new Response("login", { status: 200 }))