feat: 核心电费查询 Go 服务

- FasterLZU 登录 + xiaofubao 6 步电费链路

- shiroJID 会话缓存 + 每日记录存储

- 定时任务: 每天 00:00 记录, 失败重试 5 次

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

go/lzuapi.go

@@ -0,0 +1,130 @@
+package main
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"strings"
+	"time"
+)
+
+// lzuapi.go - FasterLZU (appservice.lzu.edu.cn) 登录客户端
+// 对应 Python lzuapi.py 中的 login() 与 get_st()
+
+const (
+	appServiceBase = "https://appservice.lzu.edu.cn"
+	lzuUserAgent   = "Mozilla/5.0 (Linux; Android 12; SM-S7110 Build/V417IR; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/101.0.4951.61 Mobile Safari/537.36 lzdx_ua JHZF_LZDXAPP"
+)
+
+// lzuClient FasterLZU API 客户端
+type lzuClient struct {
+	http         *http.Client
+	username     string
+	password     string
+	loginToken   string
+	gatewayToken string
+}
+
+func newLzuClient(username, password string) *lzuClient {
+	return &lzuClient{
+		http:     &http.Client{},
+		username: username,
+		password: password,
+	}
+}
+
+// encryptedHeaders 加密请求头
+func encryptedHeaders() http.Header {
+	h := http.Header{}
+	h.Set("Content-Type", "application/json;charset=UTF-8")
+	h.Set("Transfer-Encrypt", "true")
+	h.Set("User-Agent", lzuUserAgent)
+	return h
+}
+
+// Login 登录，返回 (loginToken, gatewayToken)
+func (c *lzuClient) Login() (string, string, error) {
+	url := appServiceBase + "/api/eusp-unify-terminal/app-user/login"
+	data := map[string]any{
+		"app_os": 2,
+		"name":   c.username,
+		"pwd":    c.password,
+	}
+	plaintext, _ := json.Marshal(data) // 无空格，与 Python separators=(",",":") 一致
+	ciphertext, err := aesEncrypt(string(plaintext))
+	if err != nil {
+		return "", "", err
+	}
+	ctx, cancel := context.WithTimeout(context.Background(), 20*time.Second)
+	defer cancel()
+	req, err := http.NewRequestWithContext(ctx, "POST", url, bytes.NewBufferString(ciphertext))
+	if err != nil {
+		return "", "", err
+	}
+	req.Header = encryptedHeaders()
+	resp, err := c.http.Do(req)
+	if err != nil {
+		return "", "", err
+	}
+	defer resp.Body.Close()
+	body, _ := io.ReadAll(resp.Body)
+
+	decrypted, err := aesDecrypt(strings.TrimSpace(string(body)))
+	if err != nil {
+		return "", "", fmt.Errorf("登录响应解密失败: %w", err)
+	}
+	var res struct {
+		Code int `json:"code"`
+		Data struct {
+			LoginToken   string `json:"login_token"`
+			GatewayToken string `json:"gateway_token"`
+		} `json:"data"`
+	}
+	if err := json.Unmarshal([]byte(decrypted), &res); err != nil {
+		return "", "", fmt.Errorf("登录响应解析失败: %w", err)
+	}
+	if res.Code != 1 {
+		return "", "", fmt.Errorf("登录失败 code=%d", res.Code)
+	}
+	c.loginToken = res.Data.LoginToken
+	c.gatewayToken = res.Data.GatewayToken
+	return c.loginToken, c.gatewayToken, nil
+}
+
+// GetSt 获取服务令牌 ST
+func (c *lzuClient) GetSt(serviceID string) (string, error) {
+	url := fmt.Sprintf("%s/api/eusp-unify-terminal/app-user/getSt?loginToken=%s&serviceId=%s&service=",
+		appServiceBase, c.loginToken, serviceID)
+	ctx, cancel := context.WithTimeout(context.Background(), 20*time.Second)
+	defer cancel()
+	req, err := http.NewRequestWithContext(ctx, "GET", url, nil)
+	if err != nil {
+		return "", err
+	}
+	req.Header = encryptedHeaders()
+	resp, err := c.http.Do(req)
+	if err != nil {
+		return "", err
+	}
+	defer resp.Body.Close()
+	body, _ := io.ReadAll(resp.Body)
+
+	decrypted, err := aesDecrypt(strings.TrimSpace(string(body)))
+	if err != nil {
+		return "", fmt.Errorf("getSt 响应解密失败: %w", err)
+	}
+	var res struct {
+		Code int    `json:"code"`
+		Data string `json:"data"`
+	}
+	if err := json.Unmarshal([]byte(decrypted), &res); err != nil {
+		return "", fmt.Errorf("getSt 响应解析失败: %w", err)
+	}
+	if res.Code != 1 {
+		return "", fmt.Errorf("getSt 失败 code=%d", res.Code)
+	}
+	return res.Data, nil
+}