feat: Add maintenance scripts and testing utilities

- Added password management utilities for user administration
- Added PowerShell scripts for testing attachment endpoints
- Enhanced development and testing workflow capabilities
- Completed v1.4.0 with all maintenance tools included"

backend/set_test_password.py

@@ -0,0 +1,59 @@
+"""
+Script para establecer contraseña real al test_user
+"""
+import asyncio
+import sys
+import os
+from sqlalchemy import select
+from passlib.context import CryptContext
+
+# Configurar el path
+backend_path = os.path.join(os.path.dirname(__file__), 'backend')
+sys.path.insert(0, backend_path)
+
+from app.core.database import AsyncSessionLocal 
+from app.models.user import User
+
+# Configurar passlib
+pwd_context = CryptContext(
+    schemes=["argon2", "bcrypt"],
+    deprecated="auto",
+    argon2__memory_cost=65536,
+    argon2__time_cost=3,
+    argon2__parallelism=4,
+)
+
+async def set_test_user_password():
+    """Establecer contraseña admin123 para test_user"""
+    
+    new_password = "admin123"
+    password_hash = pwd_context.hash(new_password)
+    
+    async with AsyncSessionLocal() as session:
+        try:
+            # Buscar test_user
+            result = await session.execute(
+                select(User).where(User.email == "test_user@example.com")
+            )
+            user = result.scalar_one_or_none()
+            
+            if not user:
+                print("❌ Usuario test_user@example.com no encontrado")
+                return
+            
+            print(f"✅ Usuario encontrado: {user.email}")
+            print(f"Hash anterior: {user.password_hash}")
+            
+            # Establecer nueva contraseña hash
+            user.password_hash = password_hash
+            await session.commit()
+            
+            print(f"🎉 Contraseña establecida: {new_password}")
+            print(f"✅ Nuevo hash: {password_hash[:50]}...")
+                
+        except Exception as e:
+            print(f"❌ Error: {e}")
+            await session.rollback()
+
+if __name__ == "__main__":
+    asyncio.run(set_test_user_password())