[FE-63] Implement freight forwarding request form

[mftee]

Overview

Build a form for shippers to request freight forwarding services for complex international shipments. All work goes in frontend/sandbox/.

Acceptance Criteria

• Page at frontend/sandbox/forwarding/request/page.tsx
• Fields: origin country/port, destination country/port, cargo description, HS code, Incoterms, required services (customs clearance, warehousing, last-mile delivery)
• Required services as multi-select checkboxes
• Preferred departure date picker
• Special instructions textarea (max 500 chars)
• Validation with Zod + React Hook Form
• Submit sends request and shows confirmation with reference number

[Trinathswain45]

Hi @mftee , I want to work on this. Pls assign me so that I can start.