feat(web-next): bindAll wires (realtime, realtimeRegistry) through every feature

Extends bindAll/bindAllProduction/bindAllDevSeed to accept BindAllDeps
and thread realtime + realtimeRegistry as the 6th and 7th positional args
into each per-feature binder. Adds bindRealtimeBridge stub (empty allowlist
in v1). bindAll accepts optional deps with InMemoryRealtimeBroadcaster
fallback so existing page-level callers stay type-safe.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

apps/web-next/src/__tests__/sign-up-welcome-email.test.ts

@@ -7,6 +7,8 @@
 import "reflect-metadata";
 import { describe, it, expect, beforeEach } from "vitest";
 import { bindAllDevSeed, __resetBindStateForTests } from "@/server/bind-production";
+import { RecordingRealtimeBroadcaster } from "@repo/core-testing/instrumentation";
+import { RealtimeHandlerRegistry } from "@repo/core-realtime";
 import { authContainer } from "@repo/auth/di/container";
 import { AUTH_SYMBOLS } from "@repo/auth/di/symbols";
 import type { ISignUpController } from "@repo/auth";
@@ -20,7 +22,10 @@ describe("e2e: sign-up triggers welcome email via cross-feature event", () => {
   });
 
   it("delivers a welcome email after a successful sign-up", async () => {
-    await bindAllDevSeed();
+    await bindAllDevSeed({
+      realtime: new RecordingRealtimeBroadcaster(),
+      realtimeRegistry: new RealtimeHandlerRegistry(),
+    });
 
     const mailer = marketingPagesContainer.get<RecordingMailerService>(
       MARKETING_PAGES_SYMBOLS.IMailerService,