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/client.ts

@@ -0,0 +1,20 @@
+import axios, { AxiosError } from 'axios';
+import Constants from 'expo-constants';
+import { logError } from '@/lib/errorLogger';
+
+const api = axios.create({
+   baseURL: Constants?.expoConfig?.extra?.URL_API
+});
+
+api.interceptors.response.use(
+   (response) => response,
+   (error: AxiosError) => {
+      const status = error.response?.status;
+      const url = error.config?.url ?? 'unknown endpoint';
+      const description = `API error ${status ?? 'network'} on ${url}`;
+      logError(description, error);
+      return Promise.reject(error);
+   }
+);
+
+export default api;