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

lib/api/banner.api.ts

@@ -0,0 +1,30 @@
+import api from './client';
+
+export const apiGetBanner = async ({ user }: { user: string }) => {
+   const response = await api.get(`mobile/banner?user=${user}`);
+   return response.data;
+};
+
+export const apiCreateBanner = async (data: FormData) => {
+   const response = await api.post('mobile/banner', data, {
+      headers: { 'Content-Type': 'multipart/form-data' },
+   })
+   return response.data;
+};
+
+export const apiDeleteBanner = async (data: { user: string }, id: string) => {
+   const response = await api.delete(`mobile/banner/${id}`, { data })
+   return response.data;
+};
+
+export const apiGetBannerOne = async ({ user, id }: { user: string, id: string }) => {
+   const response = await api.get(`mobile/banner/${id}?user=${user}`);
+   return response.data;
+};
+
+export const apiEditBanner = async (data: FormData, id: string) => {
+   const response = await api.put(`mobile/banner/${id}`, data, {
+      headers: { 'Content-Type': 'multipart/form-data' },
+   })
+   return response.data;
+};