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

features/jobs.py

@@ -0,0 +1,38 @@
+"""Registry of the platform jobs Celery Beat runs on a schedule (see
+rosterchief/settings.CELERY_BEAT_SCHEDULE).
+
+Keyed on each task's dotted Celery name -- the same string a JobRun row carries in `name`
+-- so features/signals.py can tell a tracked platform job apart from any other Celery task
+that might get added later without a job to show for it, and so the control panel's Jobs
+tab can label a JobRun without importing the task function itself.
+"""
+
+from django.utils.translation import gettext_lazy as _
+
+JOB_REGISTRY = {
+    "events.tasks.extend_event_series": {
+        "label": _("Extend event series"),
+        "description": _("Materialises recurring event occurrences up to the rolling horizon, so the calendar never runs dry."),
+        "schedule": _("Daily at 03:00"),
+    },
+    "billing.tasks.renew_subscriptions": {
+        "label": _("Renew subscriptions"),
+        "description": _("Opens the next billing period for clubs whose current one is running out."),
+        "schedule": _("Daily at 04:00"),
+    },
+    "billing.tasks.send_billing_reminders": {
+        "label": _("Send billing reminders"),
+        "description": _("Emails club admins about outstanding platform fees, once per escalation level."),
+        "schedule": _("Daily at 05:00"),
+    },
+    "billing.tasks.archive_overdue_clubs": {
+        "label": _("Archive overdue clubs"),
+        "description": _("Archives clubs unpaid past their grace period."),
+        "schedule": _("Daily at 06:00"),
+    },
+    "club.tasks.generate_seasons": {
+        "label": _("Generate seasons"),
+        "description": _("Generates the next two years of season rows for every active club, so signups and rosters never hit a missing season."),
+        "schedule": _("Monthly, 1st at 05:00"),
+    },
+}