jackyu66git b09314f317 Phase 1: SQLite persistence layer ...

- Add modernc.org/sqlite (pure Go, no CGO)
- db/ package: trades, orders, config_log tables + CRUD
- Trade persistence: every closed trade saved to SQLite
- Restart recovery: open positions restored from DB
- Automatic migration on startup

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..

db.go

Phase 1: SQLite persistence layer

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trade_repo.go

Phase 1: SQLite persistence layer

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