fix(search): restore translation guide search sync

This fixes the stale translation guide search result by repairing both the docs redirect path and the Hetzner-hosted DocSearch refresh flow.

• move the legacy /contributors/translate redirect into the docs redirect layer and cover it with redirect tests
• update the DocSearch config to stop indexing the legacy translation slug
• make the scraper scripts sync configs and indexer helpers onto /opt/docsearch and reinstall the missing systemd timer on the search host

How to test locally

• bash -n search/bin/scrape search/bin/scrape-cron
• jq empty search/config/docsearch.json
• cd server && mix format --check-formatted lib/tuist/docs/redirects.ex lib/tuist_web/plugs/legacy_redirects_plug.ex test/tuist/docs/redirects_test.exs test/tuist_web/plugs/legacy_redirects_plug_test.exs
• cd server && mix test test/tuist/docs/redirects_test.exs test/tuist_web/plugs/legacy_redirects_plug_test.exs (fails locally in this worktree because the test database is missing users)

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