feat: speed test through the browser, client - panel - browser (0.0.6)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

internal/proto/proto.go

@@ -179,10 +179,18 @@ type SysStatResult struct {
 	DiskFree  uint64  `json:"disk_free"`
 }
 
+// SysSpeedArgs are the arguments of TaskSysSpeed.
+type SysSpeedArgs struct {
+	// Relay makes the agent use the relayed streams, which the server pipes
+	// to and from the browser.
+	Relay bool `json:"relay,omitempty"`
+}
+
 // SysSpeedResult is returned for TaskSysSpeed: the agent's HTTP link to the
 // server as the agent measured it. Down is server -> agent.
 type SysSpeedResult struct {
 	PingMs  float64 `json:"ping_ms"`
 	DownBps float64 `json:"down_bps"` // bits per second
 	UpBps   float64 `json:"up_bps"`
+	Relay   bool    `json:"relay,omitempty"` // the streams went through the relay
 }