Add TED mirror site

[shanjiaming]

Summary

• Adds a TED mirror site with browse, search, topic, playlist, event, auth, account, and saved-talk workflows.
• Seeds 64 real TED talks via TED GraphQL metadata with real compressed talk thumbnails, 7 playlists, 17 event contexts, and 4 benchmark users.
• Registers TED as the 16th WebHarbor site on port 40015 and adds 18 WebVoyager-style tasks.

Assets

• HF asset tarball: ted.tar.gz
• HF dataset commit: https://huggingface.co/datasets/ChilleD/WebHarbor/commit/c9fcc7ca7e8f8abe0140d37b17903316c6b9cf22
• Contains sites/ted/instance_seed/ted.db, sites/ted/static/images/, and optional external cache dir.
• Seed DB MD5: 8ba9c3da8e8fc13d469088290a59302d
• Asset tarball MD5: d13afc5caa5ee20cb25a7dd4488efafc

Verification

• ./scripts/check_assets.sh passes.
• ./scripts/build.sh webharbor:ted-dev passes; image size ~3.1GB.
• Docker run with -p 8201:8101 -p 41000-41015:40000-40015 starts all 16 sites.
• All ports 41000-41015 return HTTP 200.
• TED _health returns {ok: true, site: ted, talks: 64}.
• /reset/ted returns ready and restores byte-identical DB:
  8ba9c3da8e8fc13d469088290a59302d /opt/WebSyn/ted/instance/ted.db
8ba9c3da8e8fc13d469088290a59302d /opt/WebSyn/ted/instance_seed/ted.db
• /reset-all returned ready for all 16 sites in ~1.1s during validation.
• State workflow checked: login as alice.j@test.com, update newsletter topic, save Waymo talk, then reset restores seed state.