Track estimated Anthropic API costs per request across all Claude API
call sites (recommender, analyze, artist-dive, generate-playlist, crate,
rabbit-hole, playlist-fix, timeline, compatibility). Log token usage and
estimated cost to the app logger. Aggregate costs in admin stats endpoint
and display total/today costs and token usage in the admin dashboard.
New endpoint POST /api/playlists/{id}/fix that analyzes a playlist
using Claude AI to identify outlier tracks that don't match the
overall vibe, and suggests better-fitting replacements.
Frontend shows results with warm amber cards for outliers and green
cards for replacements, with dismissible suggestions and visual
highlighting of flagged tracks in the track list.
