Checkpoint: management app redesign, onboarding/signup workflow, and events calendar backend

Large uncommitted body of work accumulated across sessions on this branch --
committing as a checkpoint so it's tracked and future worktree-isolated agents
see the real codebase instead of a stale ancestor commit. Covers the
management app's dedicated Tailwind theme and templates, the club onboarding
requirement/signup workflow (club/services/onboarding.py, requirement/status
models, sign-up dashboard), fee/status auto-activation decoupling, referee
management, and the new events calendar grid service layer.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01ECGMEwrc2k4D8VQuwjstj9

controlpanel/context_processors.py

@@ -0,0 +1,16 @@
+"""So the command bar's status indicator (base.html) can reflect real job health on every
+control panel page, not just the dashboard, without every view remembering to pass it.
+
+Guarded to controlpanel pages only -- unlike features.context_processors.maintenance (a
+cached read, cheap anywhere), this runs a real query, and every other page on the platform
+(club subdomains, the public site) has no command bar to show it on.
+"""
+
+from .services.jobs import recent_job_failures
+
+
+def job_health(request):
+    if not (request.resolver_match and request.resolver_match.app_name == "controlpanel"):
+        return {}
+
+    return {"failed_jobs": recent_job_failures()}