test: configurar DB en pruebas y resetear al terminar

Co-authored-by: aider (openrouter/openai/gpt-5) <aider@aider.chat>

tests/unit/services/admin.list-all.test.ts

@@ -2,6 +2,7 @@ import Database from 'bun:sqlite';
 import { initializeDatabase, ensureUserExists } from '../../../src/db';
 import { AdminService } from '../../../src/services/admin';
 import { TaskService } from '../../../src/tasks/service';
+import { setDb, resetDb } from '../../../src/db/locator';
 
 describe('AdminService - /admin ver todos', () => {
   let memdb: Database;
@@ -15,6 +16,7 @@ describe('AdminService - /admin ver todos', () => {
 
     memdb = new Database(':memory:');
     initializeDatabase(memdb);
+    setDb(memdb);
     (AdminService as any).dbInstance = memdb;
     (TaskService as any).dbInstance = memdb;
 
@@ -36,6 +38,7 @@ describe('AdminService - /admin ver todos', () => {
   });
 
   afterEach(() => {
+    resetDb();
     try { memdb.close(); } catch {}
   });