fix(tempo): fix EU base URL, trailing space in account ID, and tempo_synced tracking

Root causes found for Tempo worklogs never reaching Tempo:
1. Wrong API region: workspace is on api.eu.tempo.io/4 but code used api.tempo.io/4
   → Tempo returned "User is invalid" (400) for all POST /worklogs
2. Trailing space in jira_account_id stored in DB (now stripped with .strip())
3. tempo_synced field was never updated even on success (now set from Tempo response)

Fix: add tempo.base_url system_config key (admin-configurable without redeploy),
fall back to TEMPO_BASE_URL env-var, then global default. DB already updated with
https://api.eu.tempo.io/4 for this workspace.

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

backend/app/services/test_workflow_service.py

@@ -368,7 +368,11 @@ def _create_phase_worklog(
         # duration so the Tempo entry is identical to the Aegis worklog.
         try:
             from app.services.tempo_service import auto_log_test_worklog
-            auto_log_test_worklog(db, test, user, activity_type, duration_seconds)
+            tempo_result = auto_log_test_worklog(db, test, user, activity_type, duration_seconds)
+            if tempo_result and isinstance(tempo_result, dict):
+                wl.tempo_synced = datetime.utcnow()
+                wl.tempo_worklog_id = str(tempo_result.get("tempoWorklogId", ""))
+                db.flush()
         except Exception as e:
             logger.warning("Tempo sync failed for worklog: %s", e, exc_info=True)