Feature Request: Multi-device stats aggregation for the same account

[Fullstop000]

Support aggregating token usage stats from multiple devices under the same Tokscale account, so that profiles, leaderboards, and Wrapped reports reflect total usage across all linked devices.

Related PRs:

• feat: multi-device support with UUID device id and multi device TUI aggregation #329 feat: multi-device support with UUID device id and multi device TUI aggregation
• feat: cross-machine usage aggregation with device-level dedup #252 feat: cross-machine usage aggregation with device-level dedup
• feat: cross-machine usage aggregation + automatic sync #55 feat: cross-machine usage aggregation + automatic sync
• fix: preserve multi-machine submissions on the leaderboard #376 fix: preserve multi-machine submissions on the leaderboard
• fix(submit): preserve per-device cross-machine breakdowns #313 fix(submit): preserve per-device cross-machine breakdowns

[haridigresses]

would love to see some version of this

i have 23b on one machine and 8b on another so it's nontrivial :)