Add companyLogo field to CompanyModel and update JSON serialization

lib/models/company_model.dart

@@ -14,6 +14,7 @@ class CompanyModel extends Equatable {
   final String codiceUnivoco;
   final bool isPaid;
   final DateTime? paymentExpiration;
+  final String? companyLogo;
 
   const CompanyModel({
     required this.id,
@@ -29,6 +30,7 @@ class CompanyModel extends Equatable {
     required this.codiceUnivoco,
     required this.isPaid,
     this.paymentExpiration,
+    this.companyLogo,
   });
 
   // --- FROM JSON (Dall'input di Supabase a Dart) ---
@@ -49,6 +51,7 @@ class CompanyModel extends Equatable {
       paymentExpiration: json['payment_expiration'] != null
           ? DateTime.parse(json['payment_expiration'])
           : null,
+      companyLogo: json['company_logo'],
     );
   }
 
@@ -65,6 +68,7 @@ class CompanyModel extends Equatable {
       'codice_univoco': codiceUnivoco,
       'is_paid': isPaid,
       'payment_expiration': paymentExpiration?.toIso8601String(),
+      'company_logo': companyLogo,
       // 'id', 'created_at' e 'user_id' di solito sono gestiti dal DB in fase di insert
     };
   }
@@ -81,6 +85,7 @@ class CompanyModel extends Equatable {
     String? codiceUnivoco,
     bool? isPaid,
     DateTime? paymentExpiration,
+    String? companyLogo,
   }) {
     return CompanyModel(
       id: id,
@@ -96,6 +101,7 @@ class CompanyModel extends Equatable {
       codiceUnivoco: codiceUnivoco ?? this.codiceUnivoco,
       isPaid: isPaid ?? this.isPaid,
       paymentExpiration: paymentExpiration ?? this.paymentExpiration,
+      companyLogo: companyLogo ?? this.companyLogo,
     );
   }
 
@@ -107,5 +113,6 @@ class CompanyModel extends Equatable {
     partitaIva,
     isPaid,
     paymentExpiration,
+    companyLogo,
   ];
 }