feat: 初始化 ChatGPT Team 管理机器人

核心功能:
- 实现基于 Telegram Inline Button 交互的后台面板与用户端
- 支持通过账密登录和 RT (Refresh Token) 方式添加 ChatGPT Team 账号
- 支持管理、拉取和删除待处理邀请，支持一键清空多余邀请
- 支持按剩余容量自动生成邀请兑换码，支持分页查看与一键清空未使用兑换码
- 随机邀请功能：成功拉人后自动核销兑换码
- 定时检测 Token 状态，实现自动续订/刷新并拦截封禁账号 (处理 401/402 错误)

系统与配置:
- 使用 PostgreSQL 数据库管理账号、邀请和兑换记录
- 支持在端内动态添加、移除管理员
- 完善 Docker 部署配置与 .gitignore 规则

internal/chatgpt/client.go

@@ -0,0 +1,88 @@
+package chatgpt
+
+import (
+	"context"
+	"crypto/tls"
+	"fmt"
+	"net"
+	"net/http"
+	"net/url"
+	"time"
+
+	"golang.org/x/net/proxy"
+)
+
+const (
+	oaiClientVersion = "prod-eddc2f6ff65fee2d0d6439e379eab94fe3047f72"
+	userAgent        = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/142.0.0.0 Safari/537.36"
+	openaiClientID   = "app_EMoamEEZ73f0CkXaXp7hrann"
+)
+
+// Client wraps HTTP operations with common headers and optional proxy.
+type Client struct {
+	httpClient *http.Client
+	proxyURL   string
+}
+
+// NewClient creates a ChatGPT API client with optional proxy support.
+func NewClient(proxyURL string) *Client {
+	c := &Client{proxyURL: proxyURL}
+	c.httpClient = c.buildHTTPClient()
+	return c
+}
+
+func (c *Client) buildHTTPClient() *http.Client {
+	transport := &http.Transport{
+		TLSClientConfig: &tls.Config{MinVersion: tls.VersionTLS12},
+		IdleConnTimeout: 90 * time.Second,
+	}
+
+	if c.proxyURL != "" {
+		parsed, err := url.Parse(c.proxyURL)
+		if err == nil {
+			scheme := parsed.Scheme
+			if scheme == "socks5" || scheme == "socks5h" {
+				var auth *proxy.Auth
+				if parsed.User != nil {
+					pass, _ := parsed.User.Password()
+					auth = &proxy.Auth{
+						User:     parsed.User.Username(),
+						Password: pass,
+					}
+				}
+				dialer, dErr := proxy.SOCKS5("tcp", parsed.Host, auth, proxy.Direct)
+				if dErr == nil {
+					if ctxDialer, ok := dialer.(proxy.ContextDialer); ok {
+						transport.DialContext = ctxDialer.DialContext
+					} else {
+						transport.DialContext = func(ctx context.Context, network, addr string) (net.Conn, error) {
+							return dialer.Dial(network, addr)
+						}
+					}
+				}
+			} else {
+				transport.Proxy = http.ProxyURL(parsed)
+			}
+		}
+	}
+
+	return &http.Client{
+		Transport: transport,
+		Timeout:   60 * time.Second,
+	}
+}
+
+// buildHeaders returns common headers for ChatGPT backend API calls.
+func buildHeaders(token, chatgptAccountID string) http.Header {
+	h := http.Header{}
+	h.Set("Accept", "*/*")
+	h.Set("Accept-Language", "zh-CN,zh;q=0.9")
+	h.Set("Authorization", fmt.Sprintf("Bearer %s", token))
+	h.Set("Chatgpt-Account-Id", chatgptAccountID)
+	h.Set("Oai-Client-Version", oaiClientVersion)
+	h.Set("Oai-Language", "zh-CN")
+	h.Set("User-Agent", userAgent)
+	h.Set("Origin", "https://chatgpt.com")
+	h.Set("Referer", "https://chatgpt.com/admin/members")
+	return h
+}