Refactor API Service Layer with Axios Client and Domain-Based Services

### Description

### **Description:**

The current API layer uses raw Axios calls scattered across the codebase with repetitive headers, base URLs, and inconsistent error handling. This refactor introduces a centralized `apiClient` instance, domain-based service files (e.g., `authService`, `kycService`, `transactionService`, `recoveryService`), and prepares the system for improved maintainability, type safety, and scalability. `(middleware ?? )`

### **Acceptance Criteria:**

* [ ] A centralized Axios instance (`apiClient.ts`) is created with base URL and interceptors.
* [ ] All direct Axios calls are moved into domain-specific service files:

* `authService.ts`
* `kycService.ts`
* `transactionService.ts`
* `recoveryService.ts`
* [ ] OBS endpoints are handled via a separate Axios instance or configured `baseURL` override.
* [ ] Each service handles headers and responses in a clean, reusable format.
* [ ] Old API utility files are removed or marked as deprecated.
* [ ] Code is tested to ensure no regression in existing functionality.

### **Subtasks:**

1. **Create Axios Instance**

* Create PRS Axios Instance
* Create OBS Axios Instance
* Add global response interceptor for logging errors

2. **Refactor Auth Service**

* Move OTP and email verification logic to `authService.ts`

3. **Refactor KYC Service**

* Move KYC storage, retrieval, and status logic to `kycService.ts`

4. **Refactor Transaction Service**

* Move account balance, top-up, withdrawal, and transaction logic to `transactionService.ts`

5. **Refactor Recovery Service**

* Move recovery token and account cert logic to `recoveryService.ts`

6. **Update All Component Imports**

* Replace old Axios calls with the new service methods in relevant components/pages