feat: Implement admin role validation and enhance user management scripts

backend/scripts/README.md

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+# Backend Scripts
+
+Utility scripts for backend management tasks.
+
+## create_admin.py
+
+Creates an admin user account with elevated privileges.
+
+### Usage
+
+```bash
+cd backend
+python scripts/create_admin.py
+```
+
+The script will prompt you for:
+
+- Email address
+- Password (minimum 8 characters)
+- First name
+- Last name
+
+### Security Notes
+
+- Admin users can only be created through this script or direct database manipulation
+- The admin role cannot be assigned through the signup API
+- Existing email addresses will be rejected
+- Passwords are hashed using werkzeug's secure hash algorithm
+
+### Example
+
+```bash
+$ python scripts/create_admin.py
+=== Create Admin User ===
+
+Email: admin@example.com
+Password: ********
+First name: Admin
+Last name: User
+
+Create admin user 'admin@example.com'? (yes/no): yes
+✓ Admin user created successfully!
+  Email: admin@example.com
+  Name: Admin User
+  Role: admin
+```
+
+## Requirements
+
+The script requires the backend virtual environment to be activated:
+
+```bash
+# Windows
+.venv\Scripts\activate
+
+# Linux/Mac
+source .venv/bin/activate
+```