Resolve post-login routing and tenant context issues by proxying frontend API
calls, redirecting authenticated users away from /login, and hardening club
loading with retries/loading guards.
Align tenant identity end-to-end by returning tenantId in /api/clubs/me and
sending X-Tenant-Id from cookie-backed tenantId instead of local clubId,
restoring authorized tasks/shifts data access after club selection.
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