feat: move default term acquisition & season range from global into config state, LoadLocation once, remove bare constants

internal/config/config.go

@@ -26,12 +26,10 @@ type Config struct {
 	Environment string
 	// CentralTimeLocation is the time.Location for US Central Time.
 	CentralTimeLocation *time.Location
+	// SeasonRanges is the time.Location for US Central Time.
+	SeasonRanges *SeasonRanges
 }
 
-const (
-	CentralTimezoneName = "America/Chicago"
-)
-
 // New creates a new Config instance with a cancellable context.
 func New() (*Config, error) {
 	ctx, cancel := context.WithCancel(context.Background())
@@ -42,10 +40,13 @@ func New() (*Config, error) {
 		return nil, err
 	}
 
+	seasonRanges := GetYearDayRange(loc, uint16(time.Now().Year()))
+
 	return &Config{
 		Ctx:                 ctx,
 		CancelFunc:          cancel,
 		CentralTimeLocation: loc,
+		SeasonRanges:        &seasonRanges,
 	}, nil
 }