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>

scenarios/token-benchmark-chat.json

@@ -0,0 +1,39 @@
+{
+  "id": "token-benchmark-chat",
+  "name": "Token 基准：Direct Chat 三轮",
+  "description": "简单对话，不走做页面 Agent，对比 pro vs flash",
+  "account": {
+    "username": "john2",
+    "password": "888888"
+  },
+  "steps": [
+    {
+      "action": "chat",
+      "label": "打招呼",
+      "message": "hi",
+      "expect": {
+        "assistantMinChars": 1,
+        "timeoutMs": 120000
+      }
+    },
+    {
+      "action": "chat",
+      "label": "苏州简介",
+      "message": "用三句话介绍苏州园林，不要生成页面",
+      "expect": {
+        "assistantMinChars": 20,
+        "timeoutMs": 120000,
+        "replyKeywords": ["苏州"]
+      }
+    },
+    {
+      "action": "chat",
+      "label": "追问",
+      "message": "推荐一个最适合第一次去的，一句话说明理由",
+      "expect": {
+        "assistantMinChars": 10,
+        "timeoutMs": 120000
+      }
+    }
+  ]
+}

scenarios/token-benchmark-page.json

@@ -0,0 +1,26 @@
+{
+  "id": "token-benchmark-page",
+  "name": "Token 基准：独立苏州页面",
+  "description": "每次使用唯一文件名，避免复用已有 HTML 污染上下文",
+  "account": {
+    "username": "john2",
+    "password": "888888"
+  },
+  "steps": [
+    {
+      "action": "chat",
+      "label": "生成独立苏州页面",
+      "message": "请帮我做一个全新的苏州一日游攻略页面，保存为 public/token-bench-{{PROFILE}}-{{RUN_ID}}.html，不要修改或复用已有页面，做完直接给我链接。",
+      "expect": {
+        "assistantMinChars": 20,
+        "timeoutMs": 600000,
+        "replyKeywords": ["苏州"],
+        "page": {
+          "keywords": ["苏州"],
+          "requirePublicLink": true,
+          "requireHttp200": true
+        }
+      }
+    }
+  ]
+}