feat(gateway): global tier provider/model defaults with catalog-backed options

src/gateway/server.ts

@@ -33,6 +33,7 @@ import {
   createNodeHandlers,
 } from './handlers/index.js';
 import { discoverServices } from './handlers/services.js';
+import { createModelCatalogFetcher } from './modelCatalog.js';
 import type { TokenUsageEntry, ContextUsageEntry } from './handlers/system.js';
 import type { NodeConnectionState } from './handlers/node.js';
 import type { SessionManager } from '../session/manager.js';
@@ -206,6 +207,7 @@ export class GatewayServer {
   private registerHandlers(): void {
     const channelRegistry = this.config.channelRegistry;
     const runtimeConfig = this.config.config;
+    const modelCatalogFetcher = runtimeConfig ? createModelCatalogFetcher(runtimeConfig) : undefined;
     const systemHandlers = createSystemHandlers({
       startTime: this.startTime,
       version: this.config.version ?? '0.1.0',
@@ -225,6 +227,9 @@ export class GatewayServer {
       getServices: runtimeConfig && channelRegistry
         ? () => discoverServices(runtimeConfig, channelRegistry)
         : undefined,
+      getModelCatalog: modelCatalogFetcher
+        ? (opts) => modelCatalogFetcher(opts)
+        : undefined,
       getPresence: channelRegistry
         ? (opts) => channelRegistry.getPresence(opts)
         : undefined,
@@ -478,6 +483,7 @@ export class GatewayServer {
       const configHandlers = createConfigHandlers({
         config: this.config.config,
         persistConfig: this.config.persistConfig,
+        modelRouter: 'setClient' in this.config.modelClient ? this.config.modelClient : undefined,
       });
       for (const [method, handler] of Object.entries(configHandlers)) {
         this.router.register(method, handler);