fix: 补齐 Webterm 低频后台模式配置

config/platform-infra/webterm.yaml

@@ -54,9 +54,13 @@ browserPerformance:
       label: 断开后台连接
     receive-only:
       label: 只接收数据
+    low-frequency:
+      label: 低频绘制
     live:
       label: 实时渲染
   deferredOutputMaxBytes: 524288
+  lowFrequencyRenderIntervalMs: 10000
+  lowFrequencyRenderJitterMs: 2000
   dashboardSampleWindowSeconds: 60
   dashboardRefreshIntervalMs: 1000
 

scripts/src/platform-infra-webterm.ts

@@ -66,9 +66,11 @@ interface BrowserOutputPolicy {
 
 interface BrowserPerformance {
   animationsEnabled: boolean;
-  defaultBackgroundMode: "disconnect" | "receive-only" | "live";
-  backgroundModes: Array<{ id: "disconnect" | "receive-only" | "live"; label: string }>;
+  defaultBackgroundMode: "disconnect" | "receive-only" | "low-frequency" | "live";
+  backgroundModes: Array<{ id: "disconnect" | "receive-only" | "low-frequency" | "live"; label: string }>;
   deferredOutputMaxBytes: number;
+  lowFrequencyRenderIntervalMs: number;
+  lowFrequencyRenderJitterMs: number;
   dashboardSampleWindowSeconds: number;
   dashboardRefreshIntervalMs: number;
 }
@@ -881,10 +883,10 @@ function parseBrowserOutputPolicy(record: Record<string, unknown>, path: string)
 }
 
 function parseBrowserPerformance(record: Record<string, unknown>, path: string): BrowserPerformance {
-  const allowedModes = ["disconnect", "receive-only", "live"] as const;
+  const allowedModes = ["disconnect", "receive-only", "low-frequency", "live"] as const;
   const defaultBackgroundMode = stringField(record, "defaultBackgroundMode", path);
   if (!allowedModes.includes(defaultBackgroundMode as typeof allowedModes[number])) {
-    throw new Error(`${path}.defaultBackgroundMode must be disconnect, receive-only or live`);
+    throw new Error(`${path}.defaultBackgroundMode must reference a supported mode`);
   }
   const modesRecord = recordField(record, "backgroundModes", path);
   const backgroundModes = allowedModes.map((id) => ({
@@ -898,6 +900,8 @@ function parseBrowserPerformance(record: Record<string, unknown>, path: string):
     defaultBackgroundMode: defaultBackgroundMode as BrowserPerformance["defaultBackgroundMode"],
     backgroundModes,
     deferredOutputMaxBytes: positiveIntegerField(record, "deferredOutputMaxBytes", path),
+    lowFrequencyRenderIntervalMs: positiveIntegerField(record, "lowFrequencyRenderIntervalMs", path),
+    lowFrequencyRenderJitterMs: integerField(record, "lowFrequencyRenderJitterMs", path),
     dashboardSampleWindowSeconds: positiveIntegerField(record, "dashboardSampleWindowSeconds", path),
     dashboardRefreshIntervalMs: positiveIntegerField(record, "dashboardRefreshIntervalMs", path),
   };