feat(v2): implement operator monitoring window

v2/internal/ui/spec.go

@@ -1,5 +1,12 @@
 package ui
 
+import (
+	"fmt"
+
+	"silverpose/v2/internal/fall"
+	"silverpose/v2/internal/source"
+)
+
 // WindowSpec locks the visual baseline tested by the Windows UI Spike.  The
 // production V2 app will consume the same semantic colours and medium desktop
 // layout after the decoding/inference pipeline is complete.
@@ -8,15 +15,73 @@ type WindowSpec struct {
 	Width         int
 	Height        int
 	BackgroundHex string
+	SurfaceHex    string
+	AccentHex     string
 	AlertHex      string
 }
 
 func MonitorWindowSpec() WindowSpec {
 	return WindowSpec{
-		Title:         "Silver Pose V2 · 技术 Spike",
+		Title:         "Silver Pose V2",
 		Width:         1120,
 		Height:        720,
-		BackgroundHex: "#F3F6FA",
+		BackgroundHex: "#EAF1F8",
+		SurfaceHex:    "#FFFFFF",
+		AccentHex:     "#2563EB",
 		AlertHex:      "#C62828",
 	}
 }
+
+// ViewModel is a UI-thread-neutral snapshot. It deliberately stores only a
+// source environment variable name and status, never a resolved RTSP URL.
+type ViewModel struct {
+	ConnectionText  string
+	StateText       string
+	EventText       string
+	SettingsSummary string
+	Critical        bool
+}
+
+func NewViewModel() ViewModel {
+	return ViewModel{
+		ConnectionText: "等待启动监控",
+		StateText:      "检测状态：正常",
+		EventText:      "事件：暂无",
+	}
+}
+
+func (model *ViewModel) Apply(state fall.State, status source.Status) {
+	model.Critical = state == fall.Confirmed
+	switch state {
+	case fall.Confirmed:
+		model.StateText = "检测状态：确认摔倒"
+		model.EventText = "事件：已确认，已保存证据"
+	case fall.Suspect:
+		model.StateText = "检测状态：疑似倒地"
+		model.EventText = "事件：正在持续确认"
+	case fall.Recovering:
+		model.StateText = "检测状态：恢复观察中"
+		model.EventText = "事件：等待恢复稳定"
+	default:
+		model.StateText = "检测状态：正常"
+		model.EventText = "事件：暂无"
+	}
+	switch status {
+	case source.Connected:
+		model.ConnectionText = "视频流：在线"
+	case source.Retrying:
+		model.ConnectionText = "视频流：正在重连，不触发摔倒报警"
+	case source.Stopped:
+		model.ConnectionText = "视频流：已停止"
+	default:
+		model.ConnectionText = "视频流：正在连接"
+	}
+}
+
+func (model *ViewModel) SetSourceReady(environmentName string, ready bool) {
+	state := "未就绪"
+	if ready {
+		state = "已就绪"
+	}
+	model.SettingsSummary = fmt.Sprintf("来源环境变量 %s：%s", environmentName, state)
+}