feat(listings-frontend): add create/edit form, detail page, and listing components

- Multi-step wizard for listing creation (basic info, location, details, pricing, images)
- Listing detail page with image gallery, property specs, seller/agent info, stats
- Listings index page with filters (transaction type, property type) and pagination
- Edit page with tab-based form (read-only until backend PATCH endpoint available)
- Drag & drop image upload component with preview and multi-file support
- Dashboard layout with navigation bar
- New UI primitives: textarea, select, badge, tabs
- Listings API client with typed endpoints matching backend contract
- Zod validation schemas for all form steps
- Status badges with Vietnamese labels for all listing states
- Responsive design across all pages

Co-Authored-By: Paperclip <noreply@paperclip.ing>

apps/web/lib/api-client.ts

@@ -53,4 +53,7 @@ export const apiClient = {
 
   authPost: <T>(endpoint: string, token: string, body?: unknown) =>
     request<T>(endpoint, { method: 'POST', body, headers: authHeaders(token) }),
+
+  authPatch: <T>(endpoint: string, token: string, body?: unknown) =>
+    request<T>(endpoint, { method: 'PATCH', body, headers: authHeaders(token) }),
 };