Refactored the application structure to better separate concerns between files and packages

internal/adapters/outbound/postgres/conditions_rows.go

@@ -0,0 +1,17 @@
+// conditions_rows.go defines row DTOs for current-conditions reads.
+// Layer: adapters/outbound/postgres conditions feature.
+package postgres
+
+import "database/sql"
+
+type currentConditionsRow struct {
+	SampleCount             int64
+	TemperatureC            sql.NullFloat64
+	ApparentTemperatureC    sql.NullFloat64
+	DewpointC               sql.NullFloat64
+	RelativeHumidityPercent sql.NullFloat64
+	WindSpeedKmh            sql.NullFloat64
+	WindDirectionDegrees    sql.NullFloat64
+	ConditionCode           sql.NullInt64
+	IsDay                   sql.NullBool
+}