refactor: pecah lib/api.ts dan constants/Styles.ts per domain

- lib/api.ts (879 baris) → 13 file di lib/api/ per domain
- constants/Styles.ts (1.275 baris) → 10 file di constants/styles/ per domain
- tambah docs/FILE-HEALTH.md dan referensinya ke CLAUDE.md
- kedua file lama tetap sebagai re-export — zero breaking changes

constants/styles/border.styles.ts

@@ -0,0 +1,17 @@
+import { StyleSheet } from "react-native";
+
+const BorderStyles = StyleSheet.create({
+   round05: { borderRadius: 5 },
+   round08: { borderRadius: 8 },
+   round10: { borderRadius: 10 },
+   round15: { borderRadius: 15 },
+   round20: { borderRadius: 20 },
+   round30: { borderRadius: 30 },
+   borderRight: { borderRightWidth: 1, borderRightColor: '#d6d8f6' },
+   borderLeft: { borderLeftWidth: 1, borderLeftColor: '#d6d8f6' },
+   borderBottom: { borderBottomWidth: 1, borderBottomColor: '#d6d8f6' },
+   borderTop: { borderTopWidth: 1, borderTopColor: '#d6d8f6' },
+   borderAll: { borderWidth: 1, borderColor: '#d6d8f6' },
+});
+
+export default BorderStyles;