fix(db): use self.storage() in storage_by_account_id to avoid cache bypass

[RyanBGG]

When storage_by_account_id misses the BAL layer, it previously called self.database.storage() directly, bypassing the Cache and Bundle layers. This could return stale data when storage values have been modified in Cache or Bundle but not yet synced to BAL.
The fix changes this to call self.storage(), which correctly traverses the full lookup chain: Cache → Bundle → Database. This is consistent with the storage() method implementation and matches the expected behavior documented in the Database trait's default implementation (lines 67-80).

[codspeed-hq]

Merging this PR will not alter performance

✅ 173 untouched benchmarks

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_{Comparing RyanBGG:DBfix (bd9f06e) with main (add1b54)}

[rakita]

good find