Multi-channel publishing — X + Ko-fi draft dispatch on schedule (free mode)

• Added publish_channels D1 table (migration 024) tracking per-target, per-channel dispatch state: pending / sent / failed / cancelled
• Extended cron handler so that when a post or spell flips published=0→1, any pending publish_channels rows for that target are processed. Default (free) mode: both X and Ko-fi generate a platform-appropriate draft and keep status=pending for the operator to copy/paste manually
• Typefully API client wired but gated by TYPEFULLY_API_KEY env var. If set (paid Typefully Starter $8/mo), X channel auto-dispatches; if unset, falls back to free draft mode. No code change to flip modes
• New admin page /admin/channels/ with status tabs (pending / sent / failed / cancelled), per-row actions (retry / send-now / mark-sent / cancel), one-click draft copy button
• ScheduleModal extended with 𝕏 + ☕ Ko-fi checkboxes; selecting them creates publish_channels rows alongside the post or spell's scheduled_at
• Ko-fi has no public posting API by design — manual confirmation via Mark sent is the only available path

Ko-fi swap complete — remaining Substack CTAs removed

• Subscribe pages (/subscribe/, /zh/subscribe/) temporarily removed via 301 redirect to /about/ where the Ko-fi support CTA now lives. Newsletter strategy is under review and Substack is no longer the destination
• NewsletterCTA component repurposed as a Ko-fi support CTA at the end of every blog post. Lead-magnet props removed from BlogPost.astro since the cheatsheet is already a public page
• claude-code-cheatsheet (EN+ZH) lead-magnet box rewritten from 'Subscribe & Download' (Substack) to '☕ Buy me a coffee' (Ko-fi). The cheatsheet itself remains freely accessible
• About-page start-card 'Subscribe' CTA now links directly to ko-fi.com/labgrimoire (external) instead of the removed /subscribe/ page
• i18n keys for newsletter.* and aboutPage.start.subscribe rewritten to reflect support-on-Ko-fi semantics (EN + ZH-TW). subscribe.* keys retained for backward compatibility but no longer rendered

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