fix(psa): use resources contains identifier for my tickets filter

CW resources field is a plain string of member identifiers (login names),
not a navigable object. resources/member/id was invalid syntax causing 403.

Now resolves the CW member identifier from the cached member list and
uses: resources contains '{identifier}' which is the correct condition.

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

backend/app/services/psa/connectwise/provider.py

@@ -78,8 +78,8 @@ class ConnectWiseProvider(PSAProvider):
             conditions.append(f"status/id = {filters['status_id']}")
         if not filters.get("include_closed", False):
             conditions.append("closedFlag = false")
-        if filters.get("member_id") is not None:
-            conditions.append(f"resources/member/id = {filters['member_id']}")
+        if filters.get("member_identifier") is not None:
+            conditions.append(f"resources contains '{filters['member_identifier']}'")
         if filters.get("unassigned", False):
             conditions.append("resources = null")
         board_ids: list[int] = filters.get("board_ids") or []