Backlog: generatePDF optional user contact fields

TL;DR

Relax validation for three user-contact fields on generatePDF in CMS so Legal/Sales workflows are not blocked when those contacts are unavailable.

Description

• Requester: Mr. Hendra (frontend; same delivery team).
• Context: CMS Legal tool — PDF generation (generatePDF).
• Change: Stop treating these as mandatory (required/validation): user_primary_contact, user_billing_contact, user_billing_contact_1.
• Inbound reference: migrated from inbox capture CMS generatePDF remove mandatory user contact fields (Hendra).md.

Acceptance Criteria

• [ ] Those three fields no longer fail validation when omitted on the PDF path that uses them
• [ ] Regression check on PDF output when contacts are absent vs populated
• [ ] Stakeholder sign-off via Legal/BU lane as needed

Priority

• Priority: p2
• Rationale: Narrow validation change blocking specific workflow; urgency set by BU/Legal acceptance.

Dependencies

• Blocks: —
• Blocked by: —
• Related ADR: —

Links

• Project context: [[Projects/anabatic-contract-management-system/context/index]]
• Company: [[Resources/Companies/Anabatic Digital Raya|Anabatic Digital Raya]]
• Design / Spec:
• Ticket / Issue:

Notes

• Align implementation with CMS validation patterns already used elsewhere on Legal PDF flows.