feat(advertising): implement advertising service with CRUD operations and validation

- Added advertising.go for managing advertising entries with Create and List functionalities.
- Implemented CreateAdvertisingParams with validation for name, email, and status.
- Created migrations for advertising table structure.
- Added tests for advertising parameters validation.

feat(promo): introduce promo management with validation and CRUD operations

- Added promo.go for managing promotional entries with Create, Update, and List functionalities.
- Implemented CreatePromoParams and UpdatePromoParams with validation for position, section, and weeks.
- Created migrations for promo table structure.
- Added tests for promo parameters validation.

feat(images): add image management service with upload and retrieval

- Added images.go for managing image uploads and retrieval from storage.
- Implemented SaveImageParams with validation for image description and data.
- Created migrations for images table structure.
- Added tests for image parameters validation and data parsing.

advertising/advertising_test.go

@@ -0,0 +1,92 @@
+package advertising
+
+import "testing"
+
+func TestCreateAdvertisingParamsValidate(t *testing.T) {
+	tests := []struct {
+		name    string
+		params  *CreateAdvertisingParams
+		wantErr bool
+	}{
+		{
+			name:    "nil params",
+			params:  nil,
+			wantErr: true,
+		},
+		{
+			name: "empty email",
+			params: &CreateAdvertisingParams{
+				Nome:  "Azienda Rossi",
+				Email: "",
+			},
+			wantErr: true,
+		},
+		{
+			name: "invalid email format",
+			params: &CreateAdvertisingParams{
+				Nome:  "Azienda Rossi",
+				Email: "invalid-email-address",
+			},
+			wantErr: true,
+		},
+		{
+			name: "email missing domain dot",
+			params: &CreateAdvertisingParams{
+				Nome:  "Azienda Rossi",
+				Email: "test@domain",
+			},
+			wantErr: true,
+		},
+		{
+			name: "empty name",
+			params: &CreateAdvertisingParams{
+				Nome:  "   ",
+				Email: "azienda@rossi.it",
+			},
+			wantErr: true,
+		},
+		{
+			name: "invalid status",
+			params: &CreateAdvertisingParams{
+				Nome:   "Azienda Rossi",
+				Email:  "azienda@rossi.it",
+				Status: "pending",
+			},
+			wantErr: true,
+		},
+		{
+			name: "valid with default active status",
+			params: &CreateAdvertisingParams{
+				Nome:  "  Azienda Rossi  ",
+				Email: " AZIENDA@rossi.it ",
+			},
+			wantErr: false,
+		},
+		{
+			name: "valid with explicit inactive status",
+			params: &CreateAdvertisingParams{
+				Nome:   "Azienda Bianchi",
+				Email:  "info@bianchi.com",
+				Status: StatusInactive,
+			},
+			wantErr: false,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			err := tt.params.Validate()
+			if (err != nil) != tt.wantErr {
+				t.Errorf("Validate() error = %v, wantErr %v", err, tt.wantErr)
+			}
+			if err == nil {
+				if tt.params.Status != StatusActive && tt.params.Status != StatusInactive {
+					t.Errorf("expected Status to be active or inactive, got %s", tt.params.Status)
+				}
+				if tt.params.Email != "azienda@rossi.it" && tt.params.Email != "info@bianchi.com" {
+					t.Errorf("expected email to be normalized, got %s", tt.params.Email)
+				}
+			}
+		})
+	}
+}