Implement Update Project Endpoint

[ayshadogo]

Description:
Allow creators to update their project details.

Tasks:

• Create PATCH /projects/:id endpoint
• Create UpdateProjectDto
• Verify user is project creator or admin
• Allow updates: description, images, story
• Prevent updates: goal, deadline (or require admin approval)
• Prevent updates if campaign ended
• Return updated project

Acceptance Criteria:

• Only creator or admin can update
• Critical fields require special approval
• Completed projects cannot be edited
• Returns 403 if not authorized

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