Decoupling audit: remove coop_api, fix blog admin calendar imports

- Delete coop_api.py (dead internal API endpoint)
- Replace cross-app calendar imports with shared service calls
- Update shared submodule

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

bp/post/admin/routes.py

@@ -191,13 +191,12 @@ def register():
   @require_admin
   async def calendar_view(slug: str, calendar_id: int):
     """Show calendar month view for browsing entries"""
-    from shared.models.calendars import Calendar  # TODO: service method when admin UI is reworked
+    from shared.models.calendars import Calendar
+    from shared.utils.calendar_helpers import parse_int_arg, add_months, build_calendar_weeks
+    from shared.services.registry import services
     from sqlalchemy import select
     from datetime import datetime, timezone
-    from quart import request
     import calendar as pycalendar
-    from ...calendar.services.calendar_view import parse_int_arg, add_months, build_calendar_weeks
-    from ...calendar.services import get_visible_entries_for_period
     from quart import session as qsession
     from ..services.entry_associations import get_post_entry_ids
 
@@ -235,15 +234,13 @@ def register():
     period_end = datetime(next_y, next_m, 1, tzinfo=timezone.utc)
 
     user = getattr(g, "user", None)
+    user_id = user.id if user else None
+    is_admin = bool(user and getattr(user, "is_admin", False))
     session_id = qsession.get("calendar_sid")
 
-    visible = await get_visible_entries_for_period(
-      sess=g.s,
-      calendar_id=calendar_obj.id,
-      period_start=period_start,
-      period_end=period_end,
-      user=user,
-      session_id=session_id,
+    month_entries = await services.calendar.visible_entries_for_period(
+      g.s, calendar_obj.id, period_start, period_end,
+      user_id=user_id, is_admin=is_admin, session_id=session_id,
     )
 
     # Get associated entry IDs for this post
@@ -264,7 +261,7 @@ def register():
       next_month_year=next_month_year,
       prev_year=prev_year,
       next_year=next_year,
-      month_entries=visible.merged_entries,
+      month_entries=month_entries,
       associated_entry_ids=associated_entry_ids,
     )
     return await make_response(html)
@@ -273,7 +270,7 @@ def register():
   @require_admin
   async def entries(slug: str):
     from ..services.entry_associations import get_post_entry_ids
-    from shared.models.calendars import Calendar  # TODO: service method when admin UI is reworked
+    from shared.models.calendars import Calendar
     from sqlalchemy import select
 
     post_id = g.post_data["post"]["id"]
@@ -309,7 +306,7 @@ def register():
   @require_admin
   async def toggle_entry(slug: str, entry_id: int):
     from ..services.entry_associations import toggle_entry_association, get_post_entry_ids, get_associated_entries
-    from shared.models.calendars import Calendar  # TODO: service method when admin UI is reworked
+    from shared.models.calendars import Calendar
     from sqlalchemy import select
     from quart import jsonify