[KrazyArcher]

Fixes #72

Summary

• Implements ReplicationPlugin (plugins/replication/index.ts) extending StarbasePlugin to pull data from external databases/endpoints (e.g., Supabase Postgres, external REST/DataSource adapters) into the Durable Object's internal SQLite database for low-latency edge querying.
• Key Features:
  • Automatic SQLite table schema inference & creation (CREATE TABLE IF NOT EXISTS) with primary key mapping.
  • Paginated pull batches with idempotent INSERT OR REPLACE upserts.
  • Incremental cursor/watermark persistence in _starbase_replication_state (cursorColumn support).
  • Exposes POST /replication/sync (on-demand/cron triggerable, supports selective table sync) and GET /replication/status endpoints.
• Adds unit tests in plugins/replication/index.test.ts covering full replication, cursor advancement, and failure reporting.