feat(desktop): add Wenxin monitoring adapter and surface platform risk control

Introduces the Wenxin (文心一言) monitoring adapter and registers it in
the runtime controller and adapter index. Adds a new risk_control
failure classification with custom classifiers for Doubao and Wenxin
that recognize rate-limit, 频控 and 访问环境异常 signals, and propagates
this state through account-health, runtime activity alerts, and the
renderer views so users see "触发风控" instead of a generic challenge
message on the Home, Accounts, and AI Platforms screens.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/desktop-client/src/main/account-health.ts

@@ -602,10 +602,10 @@ export async function reportAccountFailure(
     const previousSignature = snapshotSignature(record);
     const now = Date.now();
 
-    if (classification === "challenge") {
+    if (classification === "challenge" || classification === "risk_control") {
       record.authState = "challenge_required";
       record.probeState = "idle";
-      record.authReason = "captcha_gate";
+      record.authReason = classification === "risk_control" ? "risk_control" : "captcha_gate";
       record.lastAuthFailureAt = now;
       record.lastProbeAt = now;
       record.nextProbeAt = nextRegularProbeAt(now);