feat: Implement API modules for admin, auth, exam, result, and setup functionalities

- Created adminApi.ts for admin-related operations including user management and site settings.
- Developed authApi.ts for authentication processes such as registration, login, and profile management.
- Added examApi.ts for handling exam CRUD operations.
- Introduced resultApi.ts for managing results submission and retrieval.
- Established setupApi.ts for initial setup processes and status checks.
- Created ErrorBoundary component to handle rendering errors gracefully in the frontend.
- Re-exported shared API utilities in index.ts for easier access.

backend/src/validators/authSchemas.ts

@@ -0,0 +1,41 @@
+import { z } from 'zod'
+
+export const registerSchema = z.object({
+  email: z.string().email().max(255),
+  password: z.string().min(8, 'Password must be at least 8 characters'),
+  displayName: z.string().min(1, 'Display name is required').max(100),
+})
+
+export const loginSchema = z.object({
+  email: z.string().email(),
+  password: z.string(),
+})
+
+export const verifyEmailSchema = z.object({
+  token: z.string().min(1, 'Token is required'),
+})
+
+export const resetPasswordSchema = z.object({
+  token: z.string().min(1, 'Token is required'),
+  newPassword: z.string().min(8, 'Password must be at least 8 characters'),
+})
+
+export const updateProfileSchema = z.object({
+  displayName: z.string().min(1, 'Display name is required').max(100),
+})
+
+export const changePasswordSchema = z.object({
+  currentPassword: z.string(),
+  newPassword: z.string().min(8, 'Password must be at least 8 characters'),
+})
+
+export const forgotPasswordSchema = z.object({
+  email: z.string().email().optional(),
+})
+
+export type RegisterInput = z.infer<typeof registerSchema>
+export type LoginInput = z.infer<typeof loginSchema>
+export type VerifyEmailInput = z.infer<typeof verifyEmailSchema>
+export type ResetPasswordInput = z.infer<typeof resetPasswordSchema>
+export type UpdateProfileInput = z.infer<typeof updateProfileSchema>
+export type ChangePasswordInput = z.infer<typeof changePasswordSchema>