fix: give legacy-gateway users a working way out, release 1.8.4

A Windows user upgrading over a live v1.8.0 gateway hit a dead end:
`ccmr claude` refused the old gateway and pointed at `ccmr stop`, whose
no_pid branch suggested pkill - which does not exist on Windows. The
manual-stop hint is now platform-aware (netstat + taskkill on win32),
and both refusal paths offer the zero-risk alternative of starting a
fresh gateway on another port.

Author: 鲁工

README.md

@@ -472,6 +472,12 @@ DeepSeek Anthropic 兼容接口会忽略 `metadata` 字段，但某些 Claude Co
 
 ## 更新日志
 
+### v1.8.4
+
+- **修复 v1.8.3 回归**：网关不再校验单条消息的 role/content——Claude Code v2.1+ 会在 `messages` 中携带 `role: "system"` 的上下文条目，v1.8.3 的白名单校验导致所有真实会话在本地报 `400 messages[1].role must be user or assistant`。网关现在只校验路由自身依赖的结构，消息协议交由上游判定
+- `ccmr stop` 遇到无法自报 PID 的旧网关（v1.8.1 及更早）时，按平台给出手动停止命令（Windows 用 `netstat` + `taskkill`，不再显示无效的 `pkill`），并提示可改用其他端口
+- `ccmr claude` 拒绝复用旧网关时，同时给出"换端口直接启动新网关"的出路，不再只有先停旧网关一条指引
+
 ### v1.8.3
 
 - 阻止 detached 网关跨项目复用错误的配置、端点或 API Key

dist/cli.js

@@ -1,6 +1,6 @@
 {
   "name": "claude-code-model-router",
-  "version": "1.8.3",
+  "version": "1.8.4",
   "description": "A lightweight API gateway for routing Claude Code requests to multiple AI models",
   "main": "dist/index.js",
   "types": "dist/index.d.ts",

dist/cli.js.map

@@ -275,7 +275,13 @@ program
             `\x1b[31m[ERROR]\x1b[0m The gateway on port ${port} (v${result.version}) is too old to` +
               ' report its pid.'
           );
-          console.error(`  Stop it with: pkill -f "cli.js start --port ${port}"`);
+          if (process.platform === 'win32') {
+            console.error(`  Find its PID (the LISTENING line): netstat -ano | findstr :${port}`);
+            console.error('  Then stop it with: taskkill /PID <pid> /F');
+          } else {
+            console.error(`  Stop it with: pkill -f "cli.js start --port ${port}"`);
+          }
+          console.error(`  Or leave it alone and use another port: ccmr claude --gateway-port ${port + 1}`);
           break;
         case 'unverified_gateway':
           failed = true;
@@ -518,6 +524,8 @@ program
         );
         console.error('  Stop it, then rerun - a fresh gateway will start with your current config:');
         console.error(`    ccmr stop --port ${gatewayPort}`);
+        console.error('  Or leave it alone and start fresh on another port:');
+        console.error(`    ccmr claude --gateway-port ${Number(gatewayPort) + 1}`);
       } else {
         console.error(
           `\x1b[31m[ERROR]\x1b[0m The gateway on port ${gatewayPort} belongs to a different config source.`