feat: complete P0/P1/P2 — WebUI SPA, OpenClaw sidecar+simulator, healthcheck auto-sched+perf

P0: WebUI重构
- 完整 SPA 仪表盘 (7标签页), //go:embed dashboard.html
P1: OpenClaw兼容 (三通道: SKILL.md / sidecar / simulator)
- Node.js 模拟进程统一加载任意 OpenClaw 插件
- JSON-RPC 2.0 over stdio 协议, go:embed 内嵌
P2: Healthcheck 优化
- 定时自动执行 (startAutoCheck, 30min)
- healthcheck_perf 性能监控工具

其他: agentcli/cmd 插件, integration_test, status.go,
      test_deepseek 清理, 多项 bug 修复

internal/plugins/openclaw/testdata/echoplugin/main.js

@@ -0,0 +1,106 @@
+const readline = require('readline');
+
+const rl = readline.createInterface({
+  input: process.stdin,
+  output: process.stdout,
+  terminal: false
+});
+
+const tools = [
+  {
+    name: 'echo',
+    description: 'Echo back the input text',
+    inputSchema: {
+      type: 'object',
+      properties: {
+        text: { type: 'string', description: 'Text to echo' }
+      },
+      required: ['text']
+    }
+  },
+  {
+    name: 'add',
+    description: 'Add two numbers',
+    inputSchema: {
+      type: 'object',
+      properties: {
+        a: { type: 'number', description: 'First number' },
+        b: { type: 'number', description: 'Second number' }
+      },
+      required: ['a', 'b']
+    }
+  },
+  {
+    name: 'ping',
+    description: 'Health check',
+    inputSchema: {
+      type: 'object',
+      properties: {}
+    }
+  }
+];
+
+rl.on('line', (line) => {
+  let req;
+  try {
+    req = JSON.parse(line);
+  } catch (e) {
+    sendError(null, -32700, 'Parse error');
+    return;
+  }
+
+  const id = req.id;
+  const method = req.method;
+
+  if (method === 'ping') {
+    sendResult(id, { status: 'ok' });
+    return;
+  }
+
+  if (method === 'tools/list') {
+    sendResult(id, { tools });
+    return;
+  }
+
+  if (method === 'tools/call') {
+    const params = req.params || {};
+    const toolName = params.name;
+    const args = params.arguments || {};
+
+    const tool = tools.find(t => t.name === toolName);
+    if (!tool) {
+      sendError(id, -32601, `Tool not found: ${toolName}`);
+      return;
+    }
+
+    let result;
+    switch (toolName) {
+      case 'echo':
+        result = { content: [{ type: 'text', text: `Echo: ${args.text || ''}` }] };
+        break;
+      case 'add':
+        const sum = (Number(args.a) || 0) + (Number(args.b) || 0);
+        result = { content: [{ type: 'text', text: `${sum}` }] };
+        break;
+      default:
+        sendError(id, -32601, `Not implemented: ${toolName}`);
+        return;
+    }
+    sendResult(id, result);
+    return;
+  }
+
+  sendError(id, -32601, `Method not found: ${method}`);
+});
+
+function sendResult(id, result) {
+  const resp = { jsonrpc: '2.0', id, result };
+  process.stdout.write(JSON.stringify(resp) + '\n');
+}
+
+function sendError(id, code, message) {
+  const resp = { jsonrpc: '2.0', id, error: { code, message } };
+  process.stdout.write(JSON.stringify(resp) + '\n');
+}
+
+// Sidecar is ready - no startup message needed