Submit Deliverables API

[chazdj]

Priority: Medium

Story Points: 5

Parent Epic: #58

Endpoint:

POST /applications/{id}/deliverables

Description

Implements FR-10: allow students to submit deliverables.

Requirements

• Only accepted students can submit
• File or text submission
• Timestamp stored

Acceptance Criteria

• Submission succeeds for accepted users
• Stored in DB with correct mapping
• Rejected if not accepted

Definition of Done

• Endpoint implemented
• Validation enforced
• DB schema updated
• Unit + integration tested
• API documented