feat(auto-trading): integrate MetaApi for automated trading

- Add metaapi.cloud-sdk for broker integration
- Implement AutoTradingView component
- Extend Signal interface with secondary take-profit levels
- Update UI to include auto-trading navigation tab

test_provision.cjs

@@ -0,0 +1,15 @@
+const axios = require('axios');
+async function test() {
+  try {
+    const res = await axios.post('http://localhost:3000/api/metaapi/provision', {
+      platform: 'mt4',
+      login: '123456',
+      password: 'mypassword',
+      serverName: 'Broker-Server'
+    });
+    console.log("SUCCESS:", res.data);
+  } catch (e) {
+    console.log("ERROR:", e.response?.data || e.message);
+  }
+}
+test();