feat: 实现ChatGPT Codex路由器的核心功能

- 添加完整的项目基础结构，包括配置、类型定义和常量
- 实现OAuth认证流程和令牌管理
- 开发请求转换和响应处理逻辑
- 添加SSE流处理和ChatCompletions API转换
- 实现模型映射和提示指令系统
- 包含Docker部署配置和快速启动文档
- 添加自动登录功能和测试脚本

test-longer-response.js

@@ -0,0 +1,57 @@
+const response = await fetch("http://localhost:3000/v1/chat/completions", {
+  method: "POST",
+  headers: {
+    "Content-Type": "application/json",
+  },
+  body: JSON.stringify({
+    model: "gpt-5.2",
+    messages: [
+      { role: "user", content: "What is 2+2? Answer in one sentence." },
+    ],
+    stream: true,
+  }),
+});
+
+console.log("Status:", response.status);
+
+const reader = response.body.getReader();
+const decoder = new TextDecoder();
+let buffer = "";
+let count = 0;
+let fullContent = "";
+
+while (true) {
+  const { done, value } = await reader.read();
+  if (done) break;
+
+  buffer += decoder.decode(value, { stream: true });
+  const lines = buffer.split("\n");
+  buffer = lines.pop() || "";
+
+  for (const line of lines) {
+    if (line.startsWith("data: ")) {
+      count++;
+      const data = line.substring(6);
+      if (data.trim() !== "[DONE]") {
+        try {
+          const parsed = JSON.parse(data);
+          if (parsed.choices && parsed.choices[0]) {
+            const delta = parsed.choices[0].delta;
+            if (delta.content) {
+              fullContent += delta.content;
+            }
+          }
+          console.log(
+            `Chunk ${count}: ${JSON.stringify(parsed).substring(0, 150)}`,
+          );
+        } catch (e) {
+          console.log(`Raw chunk ${count}:`, data.substring(0, 100));
+        }
+      }
+    }
+  }
+}
+
+console.log("\n=== Full Content ===");
+console.log(fullContent);
+console.log("===================");