feat(zero-cache): config to turn on SQLite-only change log mode

[tantaman]

• A new hidden setting, pgChangeLogEnabled. defaults to true.
• If false, SQLite handles:
  • resuming streams
  • storing incoming changes
  • serving catch-up data
  • deciding when changes are safe to purge
  • tracking backup progress
• PostgreSQL’s old change log is left alone and is no longer used as a fallback.
• Subscribers asking for data older than SQLite has receive a “watermark too old” error,
  prompting a fresh sync.
• Disabling PostgreSQL requires SQLite to be fully authoritative and requires a Litestream
  v5 backup, preventing unsafe configurations.

[vercel]

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