feat: add seed_admin.py for initial admin user creation

backend/scripts/seed_admin.py

@@ -0,0 +1,76 @@
+"""Seed script to create initial admin user.
+
+Usage:
+    python scripts/seed_admin.py
+
+Environment variables required:
+    DATABASE_URL=postgresql+asyncpg://user:pass@host:5432/dbname
+"""
+
+import asyncio
+import os
+import sys
+import uuid
+from datetime import datetime
+
+# Add app to path
+sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
+
+from sqlalchemy.ext.asyncio import AsyncSession, create_async_engine
+from sqlalchemy import text
+
+from app.models.user import User
+from app.services.auth_service import hash_password
+from app.config import settings
+
+
+async def seed_admin():
+    """Create initial admin user if none exists."""
+    engine = create_async_engine(settings.DATABASE_URL, echo=False)
+
+    async with engine.begin() as conn:
+        # Create tables if they don't exist
+        from app.database import Base
+        await conn.run_sync(Base.metadata.create_all)
+
+    async with AsyncSession(engine) as session:
+        # Check if any admin exists
+        result = await session.execute(
+            text("SELECT COUNT(*) FROM users WHERE role = 'admin' AND is_active = true")
+        )
+        admin_count = result.scalar()
+
+        if admin_count > 0:
+            print("Admin user already exists. Skipping seed.")
+            return
+
+        # Create admin user
+        admin = User(
+            id=uuid.uuid4(),
+            email="admin@erp.local",
+            password_hash=hash_password("Admin123!ERP"),
+            full_name="System Administrator",
+            role="admin",
+            language="de",
+            is_active=True,
+        )
+
+        session.add(admin)
+        await session.commit()
+
+        print("=" * 50)
+        print("Admin user created successfully!")
+        print("=" * 50)
+        print(f"Email: admin@erp.local")
+        print(f"Password: Admin123!ERP")
+        print(f"Role: admin")
+        print(f"Language: de")
+        print("=" * 50)
+        print("⚠️  Please change the password after first login!")
+        print("=" * 50)
+
+    await engine.dispose()
+
+
+if __name__ == "__main__":
+    asyncio.run(seed_admin())