feat(writers): quote default values based on SQL column type

Bun and GORM struct tags now emit quoted defaults for string/date/time/UUID
columns (e.g. default:'disconnected') and unquoted defaults for numeric and
boolean columns (e.g. default:0, default:true). Function-call expressions
such as now() or gen_random_uuid() are never quoted regardless of type.

Adds QuoteDefaultValue(value, sqlType) helper in pkg/writers and updates
both type mappers and the bun writer tests accordingly.

pkg/writers/bun/writer_test.go

@@ -312,7 +312,7 @@ func TestWriter_MultipleReferencesToSameTable(t *testing.T) {
 		fieldName string
 		tag       string
 	}{
-		{"RelRIDFilepointerRequestOrgAPIEvents", "join:id_filepointer=rid_filepointer_request"},  // Has many via rid_filepointer_request
+		{"RelRIDFilepointerRequestOrgAPIEvents", "join:id_filepointer=rid_filepointer_request"},   // Has many via rid_filepointer_request
 		{"RelRIDFilepointerResponseOrgAPIEvents", "join:id_filepointer=rid_filepointer_response"}, // Has many via rid_filepointer_response
 	}
 
@@ -461,10 +461,10 @@ func TestWriter_MultipleHasManyRelationships(t *testing.T) {
 
 	// Verify all has-many relationships have unique names
 	hasManyExpectations := []string{
-		"RelRIDAPIProviderOrgLogins",      // Has many via Login
+		"RelRIDAPIProviderOrgLogins",       // Has many via Login
 		"RelRIDAPIProviderOrgFilepointers", // Has many via Filepointer
-		"RelRIDAPIProviderOrgAPIEvents",   // Has many via APIEvent
-		"RelRIDOwner",                     // Has one via rid_owner
+		"RelRIDAPIProviderOrgAPIEvents",    // Has many via APIEvent
+		"RelRIDOwner",                      // Has one via rid_owner
 	}
 
 	for _, exp := range hasManyExpectations {
@@ -615,14 +615,44 @@ func TestTypeMapper_BuildBunTag(t *testing.T) {
 			want: []string{"email,", "type:varchar(255),", "nullzero,"},
 		},
 		{
-			name: "with default",
+			name: "with default string",
 			column: &models.Column{
 				Name:    "status",
 				Type:    "text",
 				NotNull: true,
 				Default: "active",
 			},
-			want: []string{"status,", "type:text,", "default:active,"},
+			want: []string{"status,", "type:text,", "default:'active',"},
+		},
+		{
+			name: "with default integer",
+			column: &models.Column{
+				Name:    "retries",
+				Type:    "integer",
+				NotNull: true,
+				Default: "0",
+			},
+			want: []string{"retries,", "type:integer,", "default:0,"},
+		},
+		{
+			name: "with default boolean",
+			column: &models.Column{
+				Name:    "active",
+				Type:    "boolean",
+				NotNull: true,
+				Default: "true",
+			},
+			want: []string{"active,", "type:boolean,", "default:true,"},
+		},
+		{
+			name: "with default function call",
+			column: &models.Column{
+				Name:    "created_at",
+				Type:    "timestamp",
+				NotNull: true,
+				Default: "now()",
+			},
+			want: []string{"created_at,", "type:timestamp,", "default:now(),"},
 		},
 		{
 			name: "auto increment with AutoIncrement flag",