chore: set up changesets for versioning and releases (#68)

.changeset/library-fixes.md

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+---
+"@sofa/server": patch
+---
+
+Fix several library, discovery, and stats issues
+
+- Fully load TV shows the first time you open them
+- Leave titles you've rated or watched out of recommendations
+- Only offer aired episodes in Continue Watching
+- Don't add duplicate watches when marking a season or show watched
+- Line up stats totals with their charts, and fix month rollover
+- Keep one failing title from stalling scheduled refreshes; manual jobs now start in the background and say when they're already running
+- Remove duplicate cast and crew entries
+- Keep the `/3` path when `TMDB_API_BASE_URL` points at a custom server