feat(router): improve direct_chat fast-path and add 103 token env sync

Route explicit text-only Q&A away from Agent before page-generation rules,
and add a script to enable Router + tighter memory budgets on 103 without
changing the global deepseek-v4-pro model.

Co-authored-by: Cursor <cursoragent@cursor.com>

chat-intent-router-rules.mjs

@@ -103,6 +103,25 @@ export const DIRECT_CHAT_FAQ_RULES = [
       /^.{0,16}(?:有什么建议|给点建议|怎么看)[？?]?$/u,
     ],
   },
+  {
+    id: 'text_only_declined_page',
+    reason: '明确要求纯文字、不生成页面/链接',
+    patterns: [
+      /(?:不要|别|无需|不需要|禁止).{0,12}(?:生成|做|制作|创建|发布).{0,8}(?:页面|网页|HTML|html|H5|h5|链接)/u,
+      /(?:纯文字|只要文字|文字回答|不要页面|不用页面|别做页面)/u,
+    ],
+  },
+  {
+    id: 'brief_intro',
+    reason: '短篇幅介绍/说明（纯文字）',
+    patterns: [
+      /(?:用|以).{0,6}(?:一|两|二|三|四|五|几|\d+).{0,4}(?:句话|句).{0,32}(?:介绍|说明|描述|讲讲|推荐)/u,
+      /^(?:简单|简要|大概|概括)(?:介绍|说明|描述|讲讲).{0,48}[？?]?$/u,
+      /^简要介绍.{0,48}(?:区别|差异|不同|对比|比较)[？?]?$/u,
+      /^(?:推荐|介绍)(?:一个|一下).{0,32}(?:理由|原因)[，,]?一句话/u,
+      /(?:推荐|介绍).{0,32}一句话.{0,16}(?:说明|讲讲).{0,12}(?:理由|原因)/u,
+    ],
+  },
 ];
 
 const MAX_FAQ_TEXT_LENGTH = 200;
@@ -111,10 +130,26 @@ const MAX_FAQ_TEXT_LENGTH = 200;
  * @param {string} text
  * @returns {{ id: string, reason: string } | null}
  */
+const EXPLICIT_TEXT_ONLY_PAGE_DECLINE = /(?:不要|别|无需|不需要|禁止).{0,12}(?:生成|做|制作|创建|发布).{0,8}(?:页面|网页|HTML|html|H5|h5|链接)/u;
+
+export function isExplicitTextOnlyRequest(text) {
+  const normalized = String(text ?? '').trim();
+  if (!normalized) return false;
+  return EXPLICIT_TEXT_ONLY_PAGE_DECLINE.test(normalized)
+    || /(?:纯文字|只要文字|文字回答|不要页面|不用页面|别做页面)/u.test(normalized);
+}
+
 export function matchDirectChatFaqRule(text) {
   const normalized = String(text ?? '').trim();
   if (!normalized || normalized.length > MAX_FAQ_TEXT_LENGTH) return null;
-  if (FAQ_EXCLUSION_PATTERNS.some((pattern) => pattern.test(normalized))) return null;
+  const declinedPage = EXPLICIT_TEXT_ONLY_PAGE_DECLINE.test(normalized)
+    || /(?:纯文字|只要文字|文字回答|不要页面|不用页面|别做页面)/u.test(normalized);
+  if (
+    !declinedPage
+    && FAQ_EXCLUSION_PATTERNS.some((pattern) => pattern.test(normalized))
+  ) {
+    return null;
+  }
   for (const rule of DIRECT_CHAT_FAQ_RULES) {
     if (rule.patterns.some((pattern) => pattern.test(normalized))) {
       return { id: rule.id, reason: rule.reason };