fix(tempo,evidence): fix SystemExit crash + evidence not shown in frontend

tempo: tempoapiclient raises SystemExit (BaseException) on API errors like
'User is invalid' 400 responses; except Exception never catches it, killing
the uvicorn worker and causing a 500. Wrap create_worklog() to intercept
BaseException and re-raise as RuntimeError so callers can catch it safely.

evidence: TestOut schema was missing red_evidences / blue_evidences fields.
The ORM model has evidences loaded via joinedload but they were never
serialized into the API response. Add both fields to TestOut and override
model_validate to split Test.evidences by team, injecting the backend-proxy
download_url for each one (/api/v1/evidence/{id}/file).

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

backend/app/services/tempo_service.py

@@ -70,15 +70,27 @@ def log_worklog(
     time_spent_seconds: int,
     description: str,
 ) -> dict:
-    """Create a worklog entry in Tempo using *user*'s personal token."""
+    """Create a worklog entry in Tempo using *user*'s personal token.
+
+    Note: tempoapiclient raises SystemExit (not Exception) on API errors, so
+    we intercept BaseException and re-raise as RuntimeError to keep it non-fatal.
+    """
     tempo = get_user_tempo_client(user)
-    return tempo.create_worklog(
-        accountId=author_account_id,
-        issueId=jira_issue_id,
-        dateFrom=date,
-        timeSpentSeconds=time_spent_seconds,
-        description=description,
-    )
+    try:
+        return tempo.create_worklog(
+            accountId=author_account_id,
+            issueId=jira_issue_id,
+            dateFrom=date,
+            timeSpentSeconds=time_spent_seconds,
+            description=description,
+        )
+    except Exception:
+        raise
+    except BaseException as exc:
+        # tempoapiclient raises SystemExit on HTTP errors (e.g. 400 Bad Request).
+        # SystemExit is a BaseException, not Exception, so convert it so callers
+        # can catch it with the usual `except Exception` pattern.
+        raise RuntimeError(f"Tempo API error: {exc}") from exc
 
 
 def auto_log_test_worklog(