fix(test): pin coffee price in cart-limit fixture

TestConvertCartLimit's quantities and expected totals were keyed to
the original 500-cent latte price. After the product price bump in
1ce63fb, coffee_id=4 became 2500 cents, so under_cap/at_cap subtests
overshot the $200 cap and over_cap's expected total magnitude was
wrong by 5x. Override coffee_id=4's price to 500 in test setup so the
cap math stays stable regardless of seed changes.

api/handlers/cart_test.go

@@ -709,6 +709,14 @@ func TestConvertCartLimit(t *testing.T) {
 				t.Fatalf("seed card: %v", err)
 			}
 
+			// Pin coffee_id=4's price so cart-cap math stays stable across
+			// seed-price changes. The cap test is about (price * quantity)
+			// vs cap, not which coffee or what the menu currently charges.
+			const pinnedPrice = 500
+			if err := db.Model(&models.Coffee{}).Where("id = ?", 4).Update("price", pinnedPrice).Error; err != nil {
+				t.Fatalf("pin coffee price: %v", err)
+			}
+
 			handler := NewCartHandler("", "", tc.capCents)
 
 			body, _ := json.Marshal(map[string]interface{}{"coffee_id": 4, "quantity": tc.quantity})
@@ -760,8 +768,8 @@ func TestConvertCartLimit(t *testing.T) {
 				if got, _ := resp.Error.Details["limit_cents"].(float64); int(got) != tc.capCents {
 					t.Errorf("limit_cents in details: want %d, got %v", tc.capCents, resp.Error.Details["limit_cents"])
 				}
-				if got, _ := resp.Error.Details["total_cents"].(float64); int(got) != tc.quantity*500 {
-					t.Errorf("total_cents in details: want %d, got %v", tc.quantity*500, resp.Error.Details["total_cents"])
+				if got, _ := resp.Error.Details["total_cents"].(float64); int(got) != tc.quantity*pinnedPrice {
+					t.Errorf("total_cents in details: want %d, got %v", tc.quantity*pinnedPrice, resp.Error.Details["total_cents"])
 				}
 			}
 		})

pkg/database/seed.go

@@ -4,8 +4,9 @@ import (
 	"fmt"
 	"log"
 
-	"gorm.io/gorm"
 	"terminalShop/pkg/models"
+
+	"gorm.io/gorm"
 )
 
 // Seed populates the database with initial data
@@ -27,7 +28,7 @@ func Seed(db *gorm.DB) error {
 			RoastType:   "Dark Roast",
 			Ounces:      2,
 			BeanType:    "Arabica",
-			Price:       350, // $3.50
+			Price:       1800, // $18.00
 			Color:       "#8B4513",
 			Description: "Bold and intense coffee with a rich crema",
 		},
@@ -36,7 +37,7 @@ func Seed(db *gorm.DB) error {
 			RoastType:   "Medium Roast",
 			Ounces:      8,
 			BeanType:    "Arabica",
-			Price:       400, // $4.00
+			Price:       2200, // $22.00
 			Color:       "#A0522D",
 			Description: "Smooth and balanced espresso diluted with hot water",
 		},
@@ -45,7 +46,7 @@ func Seed(db *gorm.DB) error {
 			RoastType:   "Medium Roast",
 			Ounces:      6,
 			BeanType:    "Arabica",
-			Price:       450, // $4.50
+			Price:       2200, // $22.00
 			Color:       "#C4A574",
 			Description: "Espresso with steamed milk and a thick layer of foam",
 		},
@@ -54,7 +55,7 @@ func Seed(db *gorm.DB) error {
 			RoastType:   "Medium Roast",
 			Ounces:      12,
 			BeanType:    "Arabica",
-			Price:       500, // $5.00
+			Price:       2500, // $25.00
 			Color:       "#D2B48C",
 			Description: "Creamy espresso with plenty of steamed milk and a touch of foam",
 		},
@@ -63,7 +64,7 @@ func Seed(db *gorm.DB) error {
 			RoastType:   "Dark Roast",
 			Ounces:      12,
 			BeanType:    "Arabica",
-			Price:       550, // $5.50
+			Price:       3000, // $30.00
 			Color:       "#8B4513",
 			Description: "Chocolate and espresso combined with steamed milk. Sweet and indulgent.",
 		},
@@ -72,7 +73,7 @@ func Seed(db *gorm.DB) error {
 			RoastType:   "Dark Roast",
 			Ounces:      3,
 			BeanType:    "Robusta Blend",
-			Price:       425, // $4.25
+			Price:       1800, // $18.00
 			Color:       "#DAA520",
 			Description: "Espresso 'marked' with a dollop of foamed milk. Small but mighty, like a tiny caffeinated warrior.",
 		},