Commit 356ab92b deleted internal/config/sync.go while adding
cmd/bd/sync_mode.go, but config.go still references the types and
functions from sync.go, causing build failures.
These serve different purposes:
- internal/config/sync.go: viper-based (config.yaml), has warnings
- cmd/bd/sync_mode.go: storage-based (database), no warnings
Both should coexist. This restores sync.go and sync_test.go from
e82e15a8, and fixes type conversion in sync.go:805.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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