feat(rust-core): add adaptive keepalive telemetry, MTU handling, and per-client rate limiting APIs

ts/smartvpn.classes.vpnclient.ts

@@ -5,6 +5,8 @@ import type {
   IVpnClientConfig,
   IVpnStatus,
   IVpnStatistics,
+  IVpnConnectionQuality,
+  IVpnMtuInfo,
   TVpnClientCommands,
 } from './smartvpn.interfaces.js';
 
@@ -65,12 +67,26 @@ export class VpnClient extends plugins.events.EventEmitter {
   }
 
   /**
-   * Get traffic statistics.
+   * Get traffic statistics (includes connection quality when connected).
    */
   public async getStatistics(): Promise<IVpnStatistics> {
     return this.bridge.sendCommand('getStatistics', {} as Record<string, never>);
   }
 
+  /**
+   * Get connection quality metrics (RTT, jitter, loss, link health).
+   */
+  public async getConnectionQuality(): Promise<IVpnConnectionQuality> {
+    return this.bridge.sendCommand('getConnectionQuality', {} as Record<string, never>);
+  }
+
+  /**
+   * Get MTU information (overhead, effective MTU, oversized packet stats).
+   */
+  public async getMtuInfo(): Promise<IVpnMtuInfo> {
+    return this.bridge.sendCommand('getMtuInfo', {} as Record<string, never>);
+  }
+
   /**
    * Stop the daemon bridge.
    */