fix(jira): correct ticket hierarchy — campaigns=Epic, all tests=Task

- Campaign issue type changed from Task to Epic (required to nest under
  Initiative OFS-20795 in classic Jira)
- Added customfield_10011 (Epic Name) — required when creating Epics
- Removed JIRA_ISSUE_TYPE_SUBTASK; all tests are now Task regardless of
  whether they are inside a campaign or standalone
- Standalone tests use the configured standalone parent (OFS-20798, an
  Epic) so Task→Task parent is never attempted
- Campaign tests use the campaign Epic key passed via parent_ticket_override

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

backend/app/config.py

@@ -51,9 +51,8 @@ class Settings(BaseSettings):
     JIRA_API_TOKEN: str = ""
     JIRA_IS_CLOUD: bool = True
     JIRA_DEFAULT_PROJECT: str = ""
-    JIRA_ISSUE_TYPE_TEST: str = "Task"
-    JIRA_ISSUE_TYPE_CAMPAIGN: str = "Task"
-    JIRA_ISSUE_TYPE_SUBTASK: str = "Sub-task"
+    JIRA_ISSUE_TYPE_TEST: str = "Task"       # tests (campaign or standalone)
+    JIRA_ISSUE_TYPE_CAMPAIGN: str = "Epic"   # campaigns (under Initiative)
 
     # ── Tempo Integration ─────────────────────────────────────────────
     TEMPO_ENABLED: bool = False