Add schema versioning to the local SQLite stores

[JSONbored]

Problem: Every one of the miner's local SQLite stores only ever does CREATE TABLE IF NOT EXISTS — there's no user_version/migration mechanism at all, unlike the main product's migrations/ discipline.

Area: AMS / Miner

Proposal: Add a lightweight schema-version column and migration-runner convention shared across all the miner's local stores.

Deliverables:

• A schema-versioning convention applied consistently across every store.

Acceptance criteria:

• Opening an older-schema database file triggers a migration rather than silent incompatibility or data loss.

Boundaries:

• Keep it lightweight — this doesn't need the full weight of the main product's migration tooling, just a real version check.

[linear-code]

JSO-3492