Files
meshcore-bot/modules
Stacy Olivas 904303ff00 infra: DB migration versioning, aiosqlite AsyncDBManager, and APScheduler
Migration versioning:
- db_migrations.py: MigrationRunner with five numbered migrations;
  schema_version table tracks applied state; migrations are append-only;
  runner called on startup from db_manager.py

AsyncDBManager:
- AsyncDBManager in db_manager.py provides non-blocking DB access in
  async coroutines via aiosqlite; exposed as bot.async_db_manager
- aiosqlite>=0.19.0 added to dependencies

APScheduler:
- scheduler.py migrated from schedule lib to APScheduler
  BackgroundScheduler + CronTrigger; schedule dependency removed

Message write queue:
- Background drain thread eliminates per-packet sqlite3.connect();
  executemany batch insert every 0.5s; shutdown path flushes remaining rows
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