feat(non-loanable-devices): implement non-loanable device management

- Add non_loanable_devices table to database schema
- Add web interface routes: /non_loanable_devices, /add_non_loanable_device, /edit_non_loanable_device, /delete_non_loanable_device
- Add CLI menu options 8-10 for non-loanable device management
- Add templates for non-loanable device CRUD operations
- Update README.md with new feature documentation
- Update REQUIREMENTS.md marking non-loanable devices as implemented
- Add gestiontablets.sh script

Implements: #porDefinir Registrar nuevos dispositivos no prestables

simple_app.py

@@ -62,6 +62,22 @@ def init_db():
             )
         ''')
         
+        # Create non_loanable_devices table
+        cursor.execute('''
+            CREATE TABLE IF NOT EXISTS non_loanable_devices (
+                id INTEGER PRIMARY KEY AUTOINCREMENT,
+                brand TEXT NOT NULL,
+                model TEXT NOT NULL,
+                serial_number TEXT UNIQUE NOT NULL,
+                device_type TEXT NOT NULL,
+                location TEXT,
+                status TEXT DEFAULT 'available',
+                notes TEXT,
+                purchase_date TEXT,
+                purchase_cost REAL
+            )
+        ''')
+        
         conn.commit()
 
 class SimpleHTTPRequestHandler(BaseHTTPRequestHandler):