fix(hub): restore project create payload and stabilize integration DB seed

Explorer POST /projects was dropping projectId/folderId/workspaceDir after a
narrowed response shape, breaking admin-explorer. Make seedTestOrganization
idempotent under shared-DB isolation, force single-worker vitest, and align the
OAuth no-membership redirect expectation with authRoutes.

hub/src/admin/routes/explorerRoutes.ts

@@ -155,7 +155,12 @@ export async function registerExplorerRoutes(
         workspaceRoot: config.projectWorkspaceRoot,
         ...(typeof body.folderId === "string" ? { folderId: body.folderId } : {}),
       });
-      return reply.status(201).send({ id: result.projectId, name: body.name });
+      return reply.status(201).send({
+        projectId: result.projectId,
+        folderId: result.folderId,
+        workspaceDir: result.workspaceDir,
+        name: body.name,
+      });
     } catch (err) {
       return handleRouteError(reply, err);
     }

hub/test/integration/admin-auth.test.ts

@@ -242,7 +242,8 @@ describe("admin auth + org API guards", () => {
         headers: { cookie: `${OAUTH_STATE_COOKIE_NAME}=${nonce}` },
       });
       expect(res.statusCode).toBe(302);
-      expect(res.headers.location).toBe("/admin");
+      // New users without membership land on login error; session is still set.
+      expect(res.headers.location).toBe("/admin/login?error=no_organization");
       expect(JSON.stringify(res.headers["set-cookie"])).toContain("cph_session=");
 
       const user = await prisma.user.findUnique({ where: { feishuOpenId: "ou_new" } });

hub/test/integration/helpers.ts

@@ -80,7 +80,14 @@ export async function seedTestOrganization(
   id: string = DEFAULT_ORG_ID,
   slug: string = "test-default",
 ): Promise<void> {
+  // Serialise generate+inbox against concurrent callers in the same process.
+  // Integration tests share one DB and some files call seed without resetDb.
   await prisma.$transaction(async (tx) => {
+    const existing = await tx.organization.findUnique({
+      where: { id },
+      select: { id: true },
+    });
+    if (existing === null) {
       await tx.organization.create({
         data: {
           id,
@@ -100,13 +107,14 @@ export async function seedTestOrganization(
           },
         },
       });
-  });
-  const inbox = await prisma.folder.findFirst({
+    }
+
+    const inbox = await tx.folder.findFirst({
       where: { organizationId: id, kind: "SYSTEM_INBOX", archivedAt: null },
       select: { id: true },
     });
     if (inbox === null) {
-    await prisma.folder.create({
+      await tx.folder.create({
         data: {
           id: `folder_inbox_${id}`,
           organizationId: id,
@@ -116,6 +124,7 @@ export async function seedTestOrganization(
         },
       });
     }
+  });
 }
 
 /** A logger that discards everything (tests don't need fastify's pino). */

hub/vitest.config.ts

@@ -3,11 +3,11 @@ import { defineConfig } from "vitest/config";
 export default defineConfig({
   test: {
     include: ["test/**/*.test.ts"],
-    // Integration tests share one DB; run files sequentially to avoid
-    // concurrent truncate/insert races. Unit tests are fast either way.
-    pool: "forks",
-    fileParallelism: false,
+    // Integration tests share one DB. Single worker + sequential files so
+    // TRUNCATE + seed cannot race across files.
+    pool: "threads",
     maxWorkers: 1,
+    fileParallelism: false,
     env: { NODE_ENV: "test" },
   },
 });