P1 flow fix: register makes a solo user by default, collective creation is an opt-in flag, post-login menu for collective-less accounts

apps/api/src/collectives/collectives.controller.ts

@@ -53,6 +53,18 @@ export class CollectivesController {
     );
   }
 
+  /**
+   * Count of collectives in MY workspace (roots only) — the post-login router:
+   * zero => the app shows the "no collectives yet" home menu (create / join /
+   * solo tools) instead of the streams wall. Cheaper and more stable than the
+   * full tree for a boolean decision; same permission as the tree read.
+   */
+  @Get("mine/count")
+  @RequirePermission("workspace.view")
+  async myCount(@Req() request: AuthedRequest): Promise<{ collectives: number; workspaceKind: "shared" | "personal" }> {
+    return this.collectives.myCollectiveCount(requireSession(request).workspaceId);
+  }
+
   /** The workspace's collective tree: collectives as roots, subcollectives nested. */
   @Get("tree")
   @RequirePermission("workspace.view")