feat(api): 接入微信登录并原生实现咨询域（ECR-049/050）

小程序可在 Go 上完成微信手机号登录、测评、预约和下单，不再反代 Java。

Co-authored-by: Cursor <cursoragent@cursor.com>

apps/api/internal/service/auth/service.go

@@ -14,9 +14,11 @@ import (
 	"golang.org/x/crypto/bcrypt"
 
 	"github.com/yuxingu/digital-psychology/apps/api/internal/avatar"
+	"github.com/yuxingu/digital-psychology/apps/api/internal/javabridge"
 	nickgen "github.com/yuxingu/digital-psychology/apps/api/internal/nickname"
 	"github.com/yuxingu/digital-psychology/apps/api/internal/repository"
 	"github.com/yuxingu/digital-psychology/apps/api/internal/textsafe"
+	"github.com/yuxingu/digital-psychology/apps/api/internal/wechat"
 )
 
 // Service handles register/login sessions.
@@ -24,6 +26,9 @@ import (
 type Service struct {
 	Repo      *repository.AuthRepo
 	AvatarDir string
+	WeChat    wechat.Client
+	WeChatApp string
+	Java      *javabridge.Client
 }
 
 // Me is the public account payload.
@@ -159,10 +164,106 @@ func (s *Service) UpdateAvatar(ctx context.Context, userID uuid.UUID, fh *multip
 	return s.Me(ctx, userID)
 }
 
+// WeChatLogin signs in with mini-program js_code + phone encryptedData.
+func (s *Service) WeChatLogin(ctx context.Context, deviceUserID uuid.UUID, deviceKey, code, encryptedData, iv string) (*SessionResult, error) {
+	if s.WeChat == nil {
+		return nil, errors.New("微信登录未配置")
+	}
+	sess, err := s.WeChat.Code2Session(ctx, code)
+	if err != nil {
+		return nil, err
+	}
+	phone, err := wechat.DecryptPhone(sess.SessionKey, encryptedData, iv, s.WeChatApp)
+	if err != nil {
+		return nil, err
+	}
+	acc, err := s.Repo.GetByWxOpenid(ctx, sess.OpenID)
+	if err == nil {
+		if acc.Status != "active" {
+			return nil, ErrAccountRestricted
+		}
+		_ = s.Repo.BindWeChat(ctx, acc.ID, sess.OpenID, sess.UnionID, phone)
+		if deviceKey != "" {
+			_ = s.Repo.BindDevice(ctx, deviceKey, acc.ID)
+		}
+		return s.finishWeChat(ctx, acc.ID, phone, acc.Nickname, false, sess, deviceKey)
+	}
+	if !errors.Is(err, pgx.ErrNoRows) {
+		return nil, err
+	}
+
+	byPhone, err := s.Repo.GetByPhone(ctx, phone)
+	if err == nil {
+		if byPhone.Status != "active" {
+			return nil, ErrAccountRestricted
+		}
+		_ = s.Repo.BindWeChat(ctx, byPhone.ID, sess.OpenID, sess.UnionID, phone)
+		if deviceKey != "" {
+			_ = s.Repo.BindDevice(ctx, deviceKey, byPhone.ID)
+		}
+		nick := byPhone.Nickname
+		if nick == "" {
+			nick = nickgen.Random()
+			_ = s.Repo.UpdateNickname(ctx, byPhone.ID, nick)
+		}
+		return s.finishWeChat(ctx, byPhone.ID, phone, nick, false, sess, deviceKey)
+	}
+	if !errors.Is(err, pgx.ErrNoRows) {
+		return nil, err
+	}
+
+	hash, err := bcrypt.GenerateFromPassword([]byte("wx:"+sess.OpenID), bcrypt.DefaultCost)
+	if err != nil {
+		return nil, err
+	}
+	nick := nickgen.Random()
+	uid := deviceUserID
+	cur, curErr := s.Repo.GetAccount(ctx, deviceUserID)
+	if curErr == nil && cur.Phone == "" && cur.WxOpenID == "" {
+		if cur.Status != "active" {
+			return nil, ErrAccountRestricted
+		}
+		if err := s.Repo.RegisterOnUser(ctx, deviceUserID, phone, string(hash), nick); err != nil {
+			return nil, errors.New("登录失败，请重试")
+		}
+		_ = s.Repo.BindWeChat(ctx, deviceUserID, sess.OpenID, sess.UnionID, phone)
+	} else {
+		uid, err = s.Repo.CreateUserWithWeChat(ctx, phone, string(hash), nick, sess.OpenID, sess.UnionID)
+		if err != nil {
+			return nil, errors.New("登录失败，请重试")
+		}
+	}
+	if deviceKey != "" {
+		_ = s.Repo.BindDevice(ctx, deviceKey, uid)
+	}
+	return s.finishWeChat(ctx, uid, phone, nick, true, sess, deviceKey)
+}
+
+func (s *Service) finishWeChat(ctx context.Context, userID uuid.UUID, phone, nickname string, isNew bool, sess wechat.Session, _ string) (*SessionResult, error) {
+	res, err := s.issue(ctx, userID, phone, nickname, isNew)
+	if err != nil {
+		return nil, err
+	}
+	if s.Java != nil && s.Java.Enabled() {
+		if tok, jerr := s.Java.IssueMiniApp(ctx, sess.OpenID, sess.UnionID, phone); jerr == nil && tok != nil {
+			_ = s.Repo.SetSessionJavaToken(ctx, res.Token, tok.AccessToken)
+			if tok.MemberID > 0 {
+				_ = s.Repo.SetJavaPlatformUserID(ctx, userID, tok.MemberID)
+			}
+		}
+	}
+	return res, nil
+}
+
 // Logout revokes the current bearer session and unbinds the device from the account
 // so a refresh no longer resolves as logged-in via X-Device-Key (Spec R5).
 func (s *Service) Logout(ctx context.Context, token, deviceKey string) error {
 	if token != "" {
+		if s.Java != nil && s.Java.Enabled() {
+			if jt, err := s.Repo.JavaTokenByGoToken(ctx, token); err == nil && jt != "" {
+				s.Java.Logout(ctx, jt)
+			}
+		}
 		if err := s.Repo.RevokeSession(ctx, token); err != nil {
 			return err
 		}