fix: apply runtime telemetry settings to web and remote clients

DS Web and remote Agent launch paths omitted shared telemetry opt-out settings. Reuse one environment definition for local launches, remote runtime profiles, and the remote model bridge helper while preserving existing update controls and user-requested networking.

Validation: 16 focused tests passed at commit time. Prior local real-model validation passed; modified Agent real-Host validation and background network monitoring remain outstanding.

Release note: 补齐 DS Web 与远程 Runtime 启动时的遥测关闭配置，保留现有自动更新关闭设置，不影响模型、MCP 和用户主动联网请求。

src/shared/runtime-privacy-environment.ts

@@ -0,0 +1,14 @@
+/** Disable optional Runtime telemetry without restricting user-requested networking. */
+export const runtimePrivacyEnvironment: Readonly<NodeJS.ProcessEnv> = Object.freeze({
+  DO_NOT_TRACK: '1',
+  OTEL_EXPORTER_OTLP_ENDPOINT: '',
+  OTEL_EXPORTER_OTLP_HEADERS: '',
+  OTEL_EXPORTER_OTLP_LOGS_ENDPOINT: '',
+  OTEL_EXPORTER_OTLP_METRICS_ENDPOINT: '',
+  OTEL_EXPORTER_OTLP_TRACES_ENDPOINT: '',
+  OTEL_LOGS_EXPORTER: 'none',
+  OTEL_LOG_USER_PROMPTS: '0',
+  OTEL_METRICS_EXPORTER: 'none',
+  OTEL_SDK_DISABLED: 'true',
+  OTEL_TRACES_EXPORTER: 'none'
+})