[Projects] Add Update Project Route (PUT /projects/{id})

[nourshoreibah]

User Story

As a user I want to update project details so that I can modify budgets or names when necessary.

Description

• Add PUT route to projects Lambda.
  Command:
  node tools/lambda-cli.js add-route projects PUT /projects/{id} --body name:string,total_budget:number
• Update projects row by projectID.
• Return updated record.

Acceptance Criteria

• Returns 200 with updated project.
• Returns 404 if not found.