Add anonymous OOBE gateway grants

Provide App Attest-bound, one-time onboarding AI access without creating accounts, with durable replay protection and production deployment safeguards.

src/main/kotlin/com/osglab/account/Application.kt

@@ -131,6 +131,11 @@ import com.osglab.account.features.inviteweb.InviteWebConfig
 import com.osglab.account.features.inviteweb.InviteOpenRecorder
 import com.osglab.account.features.inviteweb.ReferralLookupPort
 import com.osglab.account.features.inviteweb.configureInviteWebRoutes
+import com.osglab.account.features.oobe.ExposedOobeRepository
+import com.osglab.account.features.oobe.OobeGrantService
+import com.osglab.account.features.oobe.OobeRepository
+import com.osglab.account.features.oobe.OobeTokenSettings
+import com.osglab.account.features.oobe.oobeRoutes
 import com.osglab.account.features.referrals.routes.referralRoutes
 import com.osglab.account.features.referrals.services.ReferralOperations
 import com.osglab.account.features.referrals.services.ReferralService
@@ -329,6 +334,7 @@ fun Application.module() {
         healthRoutes(koin.get())
         rateLimit(AUTH_RATE_LIMIT) {
             authRoutes(koin.get())
+            oobeRoutes(koin.get())
         }
         rateLimit(ACCOUNT_RATE_LIMIT) {
             accountRoutes(koin.get())
@@ -652,8 +658,27 @@ fun accountServerModule(config: AppConfig): Module = module {
             maximumGrantLifetime = Duration.ofDays(config.session.gatewayGrantDays),
         )
     }
+    single<OobeRepository> { ExposedOobeRepository(get()) }
+    single {
+        OobeTokenSettings(
+            issuer = config.session.issuer,
+            audience = "${config.session.audience}-gateway",
+            accessTokenHmacSecret = deriveGatewaySecret(
+                config.session.hmacSecret,
+                "oobe-gateway-access",
+            ),
+            refreshTokenHmacSecret = deriveGatewaySecret(
+                config.session.hmacSecret,
+                "oobe-gateway-refresh",
+            ),
+        )
+    }
+    single { OobeGrantService(get(), get(), get()) }
     single { GatewayGrantService(get(), get()) }
-    single<GatewayAccessTokenPort> { GatewayBearerIdentity(get()) }
+    single<GatewayAccessTokenPort> {
+        val oobeGrants = get<OobeGrantService>()
+        GatewayBearerIdentity(get(), oobeGrants::authenticate)
+    }
     single<CreditReservationPort> {
         CreditReservationAdapter(
             creditService = get(),
@@ -664,7 +689,7 @@ fun accountServerModule(config: AppConfig): Module = module {
     single {
         ProviderCatalog(configuredProviders(config, get()))
     }
-    single { GatewayService(get(), get(), get(), get(), get()) }
+    single { GatewayService(get(), get(), get(), get(), get(), get()) }
     single { GatewayReconciliationService(get(), get()) }
     single {
         InviteWebConfig(