feat: add asset import services

src/lib/api-response.ts

@@ -0,0 +1,52 @@
+import { NextResponse } from 'next/server'
+import { ZodError, type z } from 'zod'
+
+/** Throwable API error with HTTP status code */
+export class ApiError extends Error {
+  status: number
+  constructor(message: string, status: number = 400) {
+    super(message)
+    this.name = 'ApiError'
+    this.status = status
+  }
+}
+
+/** Standard success response: { ok: true, ...data } */
+export function apiOk(data?: Record<string, unknown>) {
+  return NextResponse.json({ ok: true, ...data })
+}
+
+/** Standard error response: { error: message } with given status */
+export function apiError(message: string, status: number = 400) {
+  return NextResponse.json({ error: message }, { status })
+}
+
+/** Validation error from Zod: { error: fieldErrors } with 400 */
+export function apiValidationError(zodError: z.ZodError) {
+  return NextResponse.json({ error: zodError.flatten().fieldErrors }, { status: 400 })
+}
+
+/** Centralized error handler for API routes */
+export function handleApiError(error: unknown): Response {
+  if (error instanceof ApiError) {
+    return apiError(error.message, error.status)
+  }
+  if (error instanceof ZodError) {
+    return apiValidationError(error)
+  }
+  // Prisma P2025 "Record not found"
+  if (
+    error instanceof Error &&
+    (error.constructor.name === 'PrismaClientKnownRequestError' ||
+      error.name === 'PrismaClientKnownRequestError') &&
+    (error as Error & { code?: string }).code === 'P2025'
+  ) {
+    return apiError('Not found', 404)
+  }
+  console.error(
+    '[API error]',
+    error instanceof Error ? { message: error.message, name: error.name } : error,
+  )
+  return apiError('Internal server error', 500)
+}
+