feat(ops): track broker balance worker failure lifecycle and backoff

Co-authored-by: genichin <4282227+genichin@users.noreply.github.com>

trex_core/application/account_snapshot.py

@@ -52,10 +52,11 @@ class AccountSnapshotUnavailable(RuntimeError):
         "read_failed",
     })
 
-    def __init__(self, code: str) -> None:
+    def __init__(self, code: str, *, detail_code: str | None = None) -> None:
         if code not in self._CODES:
             raise ValueError(f"unsupported account snapshot error code: {code}")
         self.code = code
+        self.detail_code = detail_code
         super().__init__(f"account snapshot unavailable ({code})")
 
 
@@ -217,7 +218,9 @@ class AccountSnapshotService:
             return self._broker.get_balance()
         except BrokerBalanceError as exc:
             if exc.code != "transport_failed":
-                raise AccountSnapshotUnavailable("live_read_failed") from None
+                raise AccountSnapshotUnavailable(
+                    "live_read_failed", detail_code=exc.code
+                ) from None
         snapshot = self._load_current()
         age = self._age(snapshot.holdings_captured_at, self._sell_max_age)
         _log.warning(