fix(tickets): status filter dropdown and CW resource assignment

- Status filter: aggregate statuses across all boards (deduped by name)
  when no board is selected. Backend accepts status_name and filters by
  status/name so the same status matches across boards.
- Resource assignment: CW has no /service/tickets/{id}/members endpoint —
  assignees live in the ticket's comma-separated `resources` string field.
  Rewrote list/add/remove to read/PATCH that field via member identifier.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

backend/app/api/endpoints/integrations.py

@@ -389,6 +389,7 @@ async def search_tickets(
     query: str = "",
     board_id: int | None = None,
     status_id: int | None = None,
+    status_name: str | None = None,
     include_closed: bool = False,
     assigned_to_me: bool = False,
     unassigned: bool = False,
@@ -448,6 +449,7 @@ async def search_tickets(
             query,
             board_id=board_id,
             status_id=status_id,
+            status_name=status_name,
             include_closed=include_closed,
             member_identifier=member_identifier,
             unassigned=unassigned,