fix: P0 panic风险修复 + P1编译warnings清零 + P2代码/文档清理

P0 安全性:
- account/handlers.rs: .unwrap() → .expect() 语义化错误信息
- relay/handlers.rs: SSE Response .unwrap() → .expect()

P1 编译质量 (6 warnings → 0):
- kernel.rs: 移除未使用的 Capability import 和 config_clone 变量
- pipeline_commands.rs: 未使用变量 id → _id
- db.rs: 移除多余括号
- relay/service.rs: 移除未使用的 StreamExt import
- telemetry/service.rs: 抑制 param_idx 未读赋值警告
- main.rs: TcpKeepalive::with_retries() Linux-only 条件编译

P2 代码清理:
- 移除 handStore/HandsPanel/HandTaskPanel/gateway-api/SchedulerPanel 调试 console.log
- SchedulerPanel: 修复 updateWorkflow 未解构导致 TS 编译错误
- 文档清理 zclaw-channels 已移除 crate 的引用

crates/zclaw-kernel/src/kernel.rs

@@ -3,7 +3,7 @@
 use std::pin::Pin;
 use std::sync::Arc;
 use tokio::sync::{broadcast, mpsc, Mutex};
-use zclaw_types::{AgentConfig, AgentId, AgentInfo, Capability, Event, Result, HandRun, HandRunId, HandRunStatus, HandRunFilter, TriggerSource};
+use zclaw_types::{AgentConfig, AgentId, AgentInfo, Event, Result, HandRun, HandRunId, HandRunStatus, HandRunFilter, TriggerSource};
 #[cfg(feature = "multi-agent")]
 use zclaw_protocols::{A2aRouter, A2aAgentProfile, A2aCapability, A2aEnvelope, A2aMessageType, A2aRecipient};
 use async_trait::async_trait;
@@ -436,7 +436,6 @@ impl Kernel {
         self.memory.save_agent(&config).await?;
 
         // Register in registry
-        let config_clone = config.clone();
         self.registry.register(config);
 
         // Register with A2A router for multi-agent messaging