fix(llm): pin LLM edge functions to US/EU regions to prevent geo-block 403s (#2541)

OpenRouter returns 403 'This model is not available in your region' when
Vercel routes through edge nodes in regions where Google Gemini is blocked.
Pin chat-analyst, news, and intelligence edge functions to iad1/lhr1/fra1/sfo1.

Also improves error logging in callLlmReasoningStream to include model name
and full response body on non-2xx for easier future diagnosis.

api/chat-analyst.ts

@@ -11,7 +11,7 @@
  *   data: {"error":"..."}    — on auth/llm failure
  */
 
-export const config = { runtime: 'edge' };
+export const config = { runtime: 'edge', regions: ['iad1', 'lhr1', 'fra1', 'sfo1'] };
 
 // @ts-expect-error — JS module, no declaration file
 import { getCorsHeaders } from './_cors.js';

api/intelligence/v1/[rpc].ts

@@ -1,4 +1,4 @@
-export const config = { runtime: 'edge' };
+export const config = { runtime: 'edge', regions: ['iad1', 'lhr1', 'fra1', 'sfo1'] };
 
 import { createDomainGateway, serverOptions } from '../../../server/gateway';
 import { createIntelligenceServiceRoutes } from '../../../src/generated/server/worldmonitor/intelligence/v1/service_server';

api/news/v1/[rpc].ts

@@ -1,4 +1,4 @@
-export const config = { runtime: 'edge' };
+export const config = { runtime: 'edge', regions: ['iad1', 'lhr1', 'fra1', 'sfo1'] };
 
 import { createDomainGateway, serverOptions } from '../../../server/gateway';
 import { createNewsServiceRoutes } from '../../../src/generated/server/worldmonitor/news/v1/service_server';

server/_shared/llm.ts

@@ -293,7 +293,8 @@ export function callLlmReasoningStream(opts: LlmStreamOptions): ReadableStream<U
 
           if (!resp.ok || !resp.body) {
             clearTimeout(timeoutId);
-            console.warn(`[llm-stream:${providerName}] HTTP ${resp.status}`);
+            const errBody = resp.body ? await resp.text().catch(() => '') : '';
+            console.warn(`[llm-stream:${providerName}] HTTP ${resp.status} model=${creds.model} body=${errBody.slice(0, 300)}`);
             continue;
           }