Fix Issue

[JSE19]

Closes #1102

Changes proposed
What were you told to do?
feat(routes-f): Q&A question queue — Viewers submit questions during a stream and the streamer reads them in order.
What did you do?
Created app/api/routes-f/questions/ with:

• types.ts — TypeScript interfaces for Question, submit/answer/upvote request/response shapes
• store.ts — In-memory store with addQuestion, getPendingQuestions (sorted by queued_at), markAsAnswered, upvoteQuestion (dedup per viewer), and resetStore for test isolation
• route.ts — GET ?stream_id returns pending queue; POST { stream_id, viewer_id, question } submits a question and returns { question_id, queued_at }
• [id]/answer/route.ts — POST { creator_id } marks the question as answered (404 if missing, 409 if already answered)
• [id]/upvote/route.ts — POST { viewer_id } increments score with dedup (409 on duplicate upvote)
• tests/route.test.ts — 14 tests covering submit, list, answer, upvote flows and all error paths
  No files outside app/api/routes-f/ were touched.
  Check List
• My code follows the code style of this project.
• This PR does not contain plagiarized content.
• The title and description of the PR is clear and explains the approach.
• I am making a pull request against the main branch (left side).
• My commit messages styles matches our requested structure.
• My code additions will fail neither code linting checks nor unit test.
• I am only making changes to files I was requested to.

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