feat(project): allow projects to be deleted

[StarDylan]

No description provided.

[Copilot]

Pull request overview

Adds end-to-end support for deleting projects, including backend APIs to authorize and perform deletion and frontend UI to initiate/confirm destructive actions.

Changes:

• Expose current-user and project-info APIs to drive “owner-only” delete UI and show session counts.
• Add backend project deletion endpoint with creator-only authorization and name confirmation.
• Extend project listings with creator_user_id so the frontend can determine project ownership.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 7 comments.

File	Description
frontend/src/lib/api.ts	Adds API typings and client calls for current user, project info, and delete project.
frontend/src/components/ProjectList.tsx	Adds owner-only project menu + delete confirmation modal and wiring to delete API.
backend/src/main.py	Adds /user/me, /project/{id}/info, and /project/{id} DELETE endpoints.
backend/src/interview_helper/context_manager/database.py	Adds DB helpers for session counts, creator lookup, and cascading project deletion (including audio file cleanup).

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