feat(telemetry): carry app_version on instance_started (#681)

app_version was attached only to feedback events; every other allowlist stripped it, so the install base could not be segmented by release. One property on the once-per-boot census event covers it. Fixes #674.

apps/api/src/lib/analytics-allowlist.ts

@@ -26,7 +26,7 @@ const ALLOWED: Record<string, ReadonlySet<string>> = {
     "status",
   ]),
   ai_bundle_action: new Set(["bundle_id", "action", "duration_ms"]),
-  instance_started: new Set(["arch", "os_platform", "deploy_mode", "gpu_present"]),
+  instance_started: new Set(["arch", "os_platform", "deploy_mode", "gpu_present", "app_version"]),
   auth_login: new Set(["method"]),
   auth_login_failed: new Set(["method"]),
 };