feat(inquiries): list/get/triage/convert service + API routes (find-or-create client)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/app/api/v1/inquiries/[id]/convert/route.ts

@@ -0,0 +1,30 @@
+import { NextResponse } from 'next/server';
+
+import { withAuth, withPermission } from '@/lib/api/helpers';
+import { parseBody } from '@/lib/api/route-helpers';
+import { errorResponse, ValidationError } from '@/lib/errors';
+import { convertInquiryToClient, convertInquiryToInterest } from '@/lib/services/inquiries.service';
+import { convertInquirySchema } from '@/lib/validators/inquiries';
+
+export const POST = withAuth(
+  withPermission('inquiries', 'manage', async (req, ctx, params) => {
+    try {
+      const id = params.id;
+      if (!id) throw new ValidationError('id is required');
+      const { target } = await parseBody(req, convertInquirySchema);
+      const meta = {
+        userId: ctx.userId,
+        portId: ctx.portId,
+        ipAddress: ctx.ipAddress,
+        userAgent: ctx.userAgent,
+      };
+      const data =
+        target === 'interest'
+          ? await convertInquiryToInterest(id, ctx.portId, meta)
+          : await convertInquiryToClient(id, ctx.portId, meta);
+      return NextResponse.json({ data });
+    } catch (error) {
+      return errorResponse(error);
+    }
+  }),
+);