feat(apps): add unit tests for providers + bind-production + cms config

web-next: bindAllProduction calls all 4 feature binders exactly once;
Providers renders children. web-tanstack: equivalent providers + bind tests.
cms: payload.config exports a SanitizedConfig with all expected collections.

Spec: §6.7, §9

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

apps/web-next/src/server/bind-production.test.ts

@@ -0,0 +1,37 @@
+import { describe, it, expect, vi, beforeEach } from "vitest";
+
+vi.mock("@repo/core-cms", () => ({ default: Promise.resolve({}) }));
+vi.mock("@repo/blog/di/bind-production", () => ({ bindProductionBlog: vi.fn() }));
+vi.mock("@repo/auth/di/bind-production", () => ({ bindProductionAuth: vi.fn() }));
+vi.mock("@repo/marketing-pages/di/bind-production", () => ({ bindProductionMarketingPages: vi.fn() }));
+vi.mock("@repo/navigation/di/bind-production", () => ({ bindProductionNavigation: vi.fn() }));
+
+describe("bindAllProduction", () => {
+  beforeEach(() => {
+    vi.resetModules();
+    vi.clearAllMocks();
+  });
+
+  it("binds all four feature production repos", async () => {
+    const { bindAllProduction } = await import("./bind-production");
+    const { bindProductionBlog } = await import("@repo/blog/di/bind-production");
+    const { bindProductionAuth } = await import("@repo/auth/di/bind-production");
+    const { bindProductionMarketingPages } = await import("@repo/marketing-pages/di/bind-production");
+    const { bindProductionNavigation } = await import("@repo/navigation/di/bind-production");
+
+    await bindAllProduction();
+
+    expect(bindProductionBlog).toHaveBeenCalledOnce();
+    expect(bindProductionAuth).toHaveBeenCalledOnce();
+    expect(bindProductionMarketingPages).toHaveBeenCalledOnce();
+    expect(bindProductionNavigation).toHaveBeenCalledOnce();
+  });
+
+  it("is idempotent — second call does not re-bind", async () => {
+    const { bindAllProduction } = await import("./bind-production");
+    const { bindProductionBlog } = await import("@repo/blog/di/bind-production");
+    await bindAllProduction();
+    await bindAllProduction();
+    expect(bindProductionBlog).toHaveBeenCalledOnce();
+  });
+});