chore: ignore DuckDB WAL files (*.db.wal)

chore: add solution file and developer scripts

docs: add token authentication guide and ARM64 build note

test: add coverage for health, stats, additional_info round-trip, count clamping, ts filtering, and RequireAuthForReads (#22)

feat: validate PORT config value at startup with clear diagnostic (#21)

feat: add GitHub Actions CI/CD pipeline (#19)

refactor: ScrobblerConfig as plain POCO with standard config binding (#18)

fix: stats endpoint JSON responses now use snake_case (#17)

fix: report imported/skipped counts in import response (#16)

fix: write DB before updating in-memory cache in PlayingNowStore.Set (#12) (#15)

fix: reject GET listens requests with both max_ts and min_ts (#14)

fix: add global exception handler to prevent stack trace leaks (#10)

fix: replace curl with wget in Dockerfile HEALTHCHECK (#9)

Scaffold podcast-scrobbler: full .NET 10 API with DuckDB

docs: add README and SCAFFOLD specification