feat(gamification): show the real daily streak on the profile page (#12377)

The Profile page already rendered a streak card but fed it a hard-coded useState(0) with a "streak data comes from future API" note — while streaks.ts tracked per-key streaks all along and the MCP gamification_profile tool already returned them. GET /api/gamification/level now returns streak: { current, longest } next to level: the key's own streak with apiKeyId, the operator-wide maximum otherwise, matching the aggregate mode getAggregateXp uses (#3484). No new route, no OpenAPI change, no new i18n keys; a missing or zero streak keeps the card hidden exactly as before.

Validated in a combined worktree with all 25 PRs of this batch boarded together: typecheck:core clean, 443/443 node-runner tests plus 14/14 vitest across every test file the batch touches, and check-changelog-integrity, check:cycles (418 files), check:provider-consistency (272 REGISTRY entries, 355 canonical providers), check:docs-counts, check:docs-sync (42 locales) and check-file-size all green.

Thanks @pacocartones.