fix(self-host): show "Check rankings" action for self-hosted instances

[gortazar]

Summary

• RankTrackingDomainDetail.tsx computed isFreePlan by calling autumn-js's useCustomer() directly, with no awareness of self-hosted/local_noauth mode. Since self-hosted instances have no billing customer, this always resolved to "free plan" — and ToolbarMenus.tsx's MoreMenu doesn't just disable the "Check rankings" item when checkDisabled is true, it omits it from the DOM entirely. So the action to manually trigger a rank check was invisible on every self-hosted instance.
• The server-side triggerRankTrackingCheck function already exempts self-hosted mode from this same plan check (isHosted && !hasPaidPlan), so self-hosted users could already run checks server-side — they just had no UI path to reach the action.
• Switches to HostedPlanGate, the render-prop component two other pages (PromptExplorerPage, BrandLookupPage) already use for this exact purpose: it short-circuits to isFreePlan: false without touching Autumn at all when isHostedClientAuthMode() is false, and only defers to the real billing check in hosted mode.

Test plan

• pnpm run types:check — clean.
• pnpm run lint — clean, 0 warnings/errors.
• Verified against a real self-hosted Docker instance: built a local image from this branch, recreated the running container in place (existing D1 data preserved), confirmed the "Check rankings" menu item now appears, and triggered a real manual check that completed successfully with live SERP positions returned.

🤖 Generated with Claude Code

[Copilot]

Pull request overview

Fixes a self-hosted UI regression where the “Check rankings” action was hidden because the page incorrectly inferred a “free plan” when no billing customer exists in local_noauth / self-hosted mode.

Changes:

• Replaces direct autumn-js customer/session plan detection with HostedPlanGate to correctly treat self-hosted as non-free for gating purposes.
• Refactors the component into a small wrapper (RankTrackingDomainDetail) plus an inner implementation (RankTrackingDomainDetailInner) that consumes HostedPlanGateState.

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[bensenescu]

Hey,

Thanks for contributing!

For the next few months, I'm going to stop accepting external PRs.

Reviewing and testing them has been slowing down progress against our roadmap:
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Converting, this PR to an issue would be the best way to get it prioritized.

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