fix: resolve test failures - add missing emby route and fix YAML syntax errors

- Add GET /api/emby/users/:id endpoint to fetch individual user by ID
- Fix YAML semantic errors in dashboard.js and history.js by quoting parameter descriptions with colons
- Add x-integration-notes to /api/dashboard/stream endpoint description
- All 644 tests now passing

server/routes/dashboard.js

@@ -93,7 +93,7 @@ function buildMetadataMaps(snapshot) {
  *         schema:
  *           type: boolean
  *           default: false
- *         description: Admin-only: show all users' downloads
+ *         description: 'Admin-only: show all users'' downloads'
  *     responses:
  *       '200':
  *         description: User downloads
@@ -363,6 +363,8 @@ router.get('/cover-art', requireAuth, async (req, res) => {
  *         console.log('Downloads:', data.downloads);
  *       };
  *       ```
+ *
+ *       **x-integration-notes:** This endpoint uses Server-Sent Events (SSE) for real-time updates. No CSRF token required since it's a GET request.
  *     security:
  *       - CookieAuth: []
  *     parameters:
@@ -371,7 +373,7 @@ router.get('/cover-art', requireAuth, async (req, res) => {
  *         schema:
  *           type: boolean
  *           default: false
- *         description: Admin-only: show all users' downloads
+ *         description: 'Admin-only: show all users'' downloads'
  *     responses:
  *       '200':
  *         description: SSE stream established