Add billing-ending banner, events CRUD, RBIHF import, public API, team photos, and sponsors

A large batch of club-management features built up over one session:

- Club dashboard banner warning admins 1 month before billing ends
- Full Events/EventSeries CRUD (recurrence builder, occurrence lifecycle,
  per-team permissions), with match->game rename and game-specific fields
  (score, competition, live status, external game ID)
- Django-admin competition dropdown, gated per-club by feature flag
- Auto-import of RBIHF fixtures (scrape -> diff -> preview -> confirm),
  with location/opponent dropdowns suggested from existing club data
- Feature-flag-gated Shop/Forms nav sections, reusing the same flag
  machinery for the RBIHF import button
- Team roster now scoped to members active this season or next, sorted and
  grouped by position
- Club sport type (ice hockey / other), shown in the control panel's club
  subtitle
- Per-season team photo upload from the team page
- New public read-only API (Django Ninja) at /api/v1/: news, team rosters,
  upcoming/live/per-team games, and sponsors -- auto-documented via Swagger
  UI, CORS-enabled for a club's own external website
- Club sponsors: admin-only CRUD (logo, URL, active date window) plus a
  date-windowed, optionally randomized API endpoint
- Assorted fixes: NullBooleanField dropdown rendering, cross-club event
  validation timing, searchable-select chip placement, btn-neutral ->
  default button style sweep, calendar-month chart windows

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01R1gj3J1QPfP38XWpnpbFpy

events/competition/hockey.py

@@ -0,0 +1,90 @@
+from urllib.parse import urljoin
+
+import requests
+
+from ..models import Event
+from .base import CompetitionBaseClass
+
+
+class RBIHF(CompetitionBaseClass):
+    def __init__(self):
+        super().__init__()
+        self.url = "https://rbihf.be/modules/league/ajax/time.php"
+
+    def update_game_information(self, event: Event) -> None:
+        season = "{start}{end}".format(start=event.season.start_date.strftime("%y"), end=event.season.end_date.strftime("%y"))
+
+        payload = {"gameNr": event.external_game_id, "season": season}
+        headers = {
+            "Cookie": "language=en",
+            "Postman-Token": "rosterchief",
+            "Host": "www.rbihf.be",
+            "User-Agent": "PostmanRuntime/7.37.0",
+            "Accept": "application/json",
+            "Accept-Encoding": "gzip,deflate,br",
+            "Connection": "keep-alive",
+            "Referer": f"https://rbihf.be/game/{event.external_game_id}",
+            "X-Requested-With": "XMLHttpRequest",
+        }
+
+        req = requests.get(self.url, params=payload, headers=headers)
+
+        if req.status_code == 200:
+            game_data = req.json()
+
+            event.is_live = game_data["live"]
+
+            if event.is_home_game:
+                event.score_for = game_data["scoreA"]
+                event.score_against = game_data["scoreB"]
+            else:
+                event.score_for = game_data["scoreB"]
+                event.score_against = game_data["scoreA"]
+
+            event.save(update_fields=["is_live", "score_for", "score_against"])
+
+
+class CEHL(CompetitionBaseClass):
+    def __init__(self):
+        super().__init__()
+        self.url = "https://www.cehl.eu/ajax/"
+
+    def update_game_information(self, event: Event) -> None:
+        season = "{start}{end}".format(start=event.season.start_date.strftime("%y"), end=event.season.end_date.strftime("%y"))
+
+        referer_url = urljoin("https://www.cehl.eu", f"game/{season}/{event.external_game_id}")
+        timeline_url = urljoin(self.url, "timeline.php")
+        score_url = urljoin(self.url, "score.php")
+
+        payload = {"nr": event.external_game_id, "season": season}
+        headers = {
+            "Cookie": "language=en",
+            "Postman-Token": "rosterchief",
+            "Host": "www.cehl.eu",
+            "User-Agent": "PostmanRuntime/7.37.0",
+            "Accept": "*/*",
+            "Accept-Encoding": "gzip,deflate,br",
+            "Connection": "close",
+            "Referer": referer_url,
+            "X-Requested-With": "XMLHttpRequest",
+        }
+
+        timeline_req = requests.get(timeline_url, params=payload, headers=headers)
+        score_req = requests.get(score_url, params=payload, headers=headers)
+
+        if timeline_req.status_code == 200:
+            event.is_live = timeline_req.json()["live"] == 1
+
+        if score_req.status_code == 200:
+            game_data = score_req.json()
+
+            if event.is_home_game:
+                event.score_for = game_data["scoreA"]
+                event.score_against = game_data["scoreB"]
+
+            else:
+                event.score_for = game_data["scoreB"]
+                event.score_against = game_data["scoreA"]
+
+        if timeline_req.status_code == 200 or score_req.status_code == 200:
+            event.save(update_fields=["is_live", "score_for", "score_against"])