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-up.use-case.ts

@@ -2,45 +2,43 @@ import { AuthenticationError } from "../../entities/errors/auth";
 import type { Cookie } from "../../entities/models/cookie";
 import type { Session } from "../../entities/models/session";
 import type { User } from "../../entities/models/user";
-import { authContainer } from "../../di/container";
-import { AUTH_SYMBOLS } from "../../di/symbols";
 import type { IUsersRepository } from "../repositories/users.repository.interface";
 import type { IAuthenticationService } from "../services/authentication.service.interface";
 
-export async function signUpUseCase(input: {
-  username: string;
-  password: string;
-}): Promise<{
-  session: Session;
-  cookie: Cookie;
-  user: Pick<User, "id" | "username">;
-}> {
-  const usersRepository = authContainer.get<IUsersRepository>(
-    AUTH_SYMBOLS.IUsersRepository,
-  );
-  const authService = authContainer.get<IAuthenticationService>(
-    AUTH_SYMBOLS.IAuthenticationService,
-  );
+export type ISignUpUseCase = ReturnType<typeof signUpUseCase>;
 
-  const existingUser = await usersRepository.getUserByUsername(input.username);
-  if (existingUser) {
-    throw new AuthenticationError("Username taken");
-  }
+export const signUpUseCase =
+  (
+    usersRepository: IUsersRepository,
+    authenticationService: IAuthenticationService,
+  ) =>
+  async (input: {
+    username: string;
+    password: string;
+  }): Promise<{
+    session: Session;
+    cookie: Cookie;
+    user: Pick<User, "id" | "username">;
+  }> => {
+    const existingUser = await usersRepository.getUserByUsername(input.username);
+    if (existingUser) {
+      throw new AuthenticationError("Username taken");
+    }
 
-  const passwordHash = await authService.hashPassword(input.password);
-  const userId = authService.generateUserId();
+    const passwordHash = await authenticationService.hashPassword(input.password);
+    const userId = authenticationService.generateUserId();
 
-  const newUser = await usersRepository.createUser({
-    id: userId,
-    username: input.username,
-    passwordHash,
-  });
+    const newUser = await usersRepository.createUser({
+      id: userId,
+      username: input.username,
+      passwordHash,
+    });
 
-  const { cookie, session } = await authService.createSession(newUser);
+    const { cookie, session } = await authenticationService.createSession(newUser);
 
-  return {
-    cookie,
-    session,
-    user: { id: newUser.id, username: newUser.username },
+    return {
+      cookie,
+      session,
+      user: { id: newUser.id, username: newUser.username },
+    };
   };
-}