refactor(auth): factory-style use cases + controllers + real Payload impls

- Use cases (sign-in, sign-up, sign-out) → factory functions with I*UseCase aliases
- Controllers → factory functions with I*Controller aliases
- DI symbols + module updated with .toDynamicValue() bindings for factories
- New: real UsersRepository (Payload-backed, SanitizedConfig, contract-tested)
- New: real AuthenticationService (node:crypto hashing/UUIDs; createSession/
  validateSession/invalidateSession deferred — see refactor log §7)
- bindProductionAuth swaps both mocks for real impls (was a no-op before)
- Tests refactored to construct mocks and inject directly (no container rebinding)
- Feature test constructs full chain via direct factory injection

Refactor log: §2, §4.1, §4.2, §5.1, §5.2, §6.1, §7
Spec: §6.1, §7

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

packages/auth/src/application/use-cases/sign-out.use-case.ts

@@ -1,13 +1,10 @@
 import type { Cookie } from "../../entities/models/cookie";
-import { authContainer } from "../../di/container";
-import { AUTH_SYMBOLS } from "../../di/symbols";
 import type { IAuthenticationService } from "../services/authentication.service.interface";
 
-export async function signOutUseCase(
-  sessionId: string,
-): Promise<{ blankCookie: Cookie }> {
-  const authService = authContainer.get<IAuthenticationService>(
-    AUTH_SYMBOLS.IAuthenticationService,
-  );
-  return await authService.invalidateSession(sessionId);
-}
+export type ISignOutUseCase = ReturnType<typeof signOutUseCase>;
+
+export const signOutUseCase =
+  (authenticationService: IAuthenticationService) =>
+  async (sessionId: string): Promise<{ blankCookie: Cookie }> => {
+    return await authenticationService.invalidateSession(sessionId);
+  };