Story 2: Project screenshot upload via Cloudinary

[jeromehardaway]

Epic: #1155
Story Points: 2
Priority: High
Dependencies: Story 1

User Story

As a veteran adding a project
I want to upload a screenshot
So that my project card is visual and recruiter-ready

Acceptance Criteria

• Reuse the existing signed-upload flow (src/pages/api/upload/signature.ts + src/pages/api/upload/image.ts) — do not add a new upload mechanism
• Upload to a dedicated Cloudinary folder (e.g. portfolio-projects/)
• Validate file type (image only) and size before upload
• Persist the returned secure URL to Project.imageUrl
• Graceful error + retry on failure (no hung spinner)

Technical Notes

• Use src/lib/cloudinary*.ts helpers for URL handling
• Request a signature from the API, then upload direct-to-Cloudinary

Definition of Done

• Image uploads and renders on the project card
• Upload failure surfaces a clear message
• typecheck / lint / test pass; reviewed and merged