fix(share): let link-preview crawlers fetch /watch/ pages (robots.txt)
Shared links didn't unfurl in Messenger: robots.txt disallowed /watch/ for ALL user-agents, so facebookexternalhit honoured it and got a blocked (403) fetch — the OG tags were correct but never read. Add an allow group for the link-preview bots (facebookexternalhit, Twitterbot, Discordbot, WhatsApp, Slack, Telegram, LinkedIn, …) so they can fetch share pages; the wildcard still keeps /watch/ out of search indexes. Release v0.32.1.
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