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

desktop/src/store/handStore.ts

@@ -212,17 +212,11 @@ export const useHandStore = create<HandStore>((set, get) => ({
 
   loadHands: async () => {
     const client = get().client;
-    console.log('[HandStore] loadHands called, client:', !!client);
-    if (!client) {
-      console.warn('[HandStore] No client available, skipping loadHands');
-      return;
-    }
+    if (!client) return;
 
     set({ isLoading: true });
     try {
-      console.log('[HandStore] Calling client.listHands()...');
       const result = await client.listHands();
-      console.log('[HandStore] listHands result:', result);
       const validStatuses = ['idle', 'running', 'needs_approval', 'error', 'unavailable', 'setup_needed'] as const;
       const hands: Hand[] = (result?.hands || []).map((h: Record<string, unknown>) => {
         const status = validStatuses.includes(h.status as Hand['status'])
@@ -240,7 +234,6 @@ export const useHandStore = create<HandStore>((set, get) => ({
           metricCount: (h.metric_count as number) || ((h.metrics as unknown[])?.length),
         };
       });
-      console.log('[HandStore] Mapped hands:', hands.length, 'items');
       set({ hands, isLoading: false });
     } catch (err) {
       console.error('[HandStore] loadHands error:', err);