Feat/logger support log level validation0222 (#23436)

* 1、环境变量**：新增 `OPENCLAW_LOG_LEVEL`，可取值 `silent|fatal|error|warn|info|debug|trace`。设置后同时覆盖**文件日志**与**控制台**的级别，优先级高于配置文件。
2、启动参数**：在 `openclaw gateway run` 上新增 `--log-level <level>`，对该次进程同时生效于文件与控制台；未传时仍使用环境变量或配置文件。

* fix(logging): make log-level override global and precedence-safe

---------

Co-authored-by: Peter Steinberger <steipete@gmail.com>

src/logging/logger.ts

@@ -5,6 +5,7 @@ import type { OpenClawConfig } from "../config/types.js";
 import { resolvePreferredOpenClawTmpDir } from "../infra/tmp-openclaw-dir.js";
 import { readLoggingConfig } from "./config.js";
 import type { ConsoleStyle } from "./console.js";
+import { resolveEnvLogLevelOverride } from "./env-log-level.js";
 import { type LogLevel, levelToMinLevel, normalizeLogLevel } from "./levels.js";
 import { resolveNodeRequireFromMeta } from "./node-require.js";
 import { loggingState } from "./state.js";
@@ -67,7 +68,9 @@ function resolveSettings(): ResolvedSettings {
   }
   const defaultLevel =
     process.env.VITEST === "true" && process.env.OPENCLAW_TEST_FILE_LOG !== "1" ? "silent" : "info";
-  const level = normalizeLogLevel(cfg?.level, defaultLevel);
+  const fromConfig = normalizeLogLevel(cfg?.level, defaultLevel);
+  const envLevel = resolveEnvLogLevelOverride();
+  const level = envLevel ?? fromConfig;
   const file = cfg?.file ?? defaultRollingPathForToday();
   return { level, file };
 }