5687dc20e0
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middleware_chain 从 Option<MiddlewareChain> 改为 MiddlewareChain: - 移除 6 处 use_middleware 分支 + 2 处 legacy loop_guard inline path - 移除 loop_guard field + Mutex import + circuit_breaker_triggered 变量 - 空 chain (Default) 行为等价于 middleware path 中的 no-op - 1154行 → 1023行，净减 131 行 - cargo check --workspace ✓ | cargo test ✓ (排除 desktop 预存编译问题)