fix: admin 初始化在数据库未就绪时静默失败

initAdmin 改为后台 goroutine 并重试最多 30 秒，避免 users-rpc
启动时 PostgreSQL 尚未接受连接导致管理员账户创建失败。

app/users/rpc/admin_init.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"os"
 	"strings"
+	"time"
 
 	"juwan-backend/app/snowflake/rpc/snowflake"
 	"juwan-backend/app/users/rpc/internal/models/users"
@@ -21,40 +22,53 @@ func initAdmin(svcCtx *svc.ServiceContext) {
 		return
 	}
 
-	ctx := context.Background()
-	exists, _ := svcCtx.UsersModelRW.Users.Query().Where(users.UsernameEQ(username)).Exist(ctx)
-	if exists {
-		return
-	}
+	go func() {
+		ctx := context.Background()
+		for i := range 30 {
+			exists, err := svcCtx.UsersModelRW.Users.Query().Where(users.UsernameEQ(username)).Exist(ctx)
+			if err != nil {
+				if i < 29 {
+					time.Sleep(time.Second)
+					continue
+				}
+				logx.Errorf("check admin user: %v", err)
+				return
+			}
+			if exists {
+				return
+			}
+			break
+		}
 
-	hashedPassword, err := pwdUtils.HashPassword(password)
-	if err != nil {
-		logx.Errorf("hash admin password: %v", err)
-		return
-	}
+		hashedPassword, err := pwdUtils.HashPassword(password)
+		if err != nil {
+			logx.Errorf("hash admin password: %v", err)
+			return
+		}
 
-	resp, err := svcCtx.Snowflake.NextId(ctx, &snowflake.NextIdReq{})
-	if err != nil {
-		logx.Errorf("generate admin user ID: %v", err)
-		return
-	}
+		resp, err := svcCtx.Snowflake.NextId(ctx, &snowflake.NextIdReq{})
+		if err != nil {
+			logx.Errorf("generate admin user ID: %v", err)
+			return
+		}
 
-	_, err = svcCtx.UsersModelRW.Users.Create().
-		SetID(resp.Id).
-		SetUsername(username).
-		SetPasswordHash(hashedPassword).
-		SetEmail(email).
-		SetPhone("").
-		SetBio("").
-		SetAvatar("").
-		SetCurrentRole("consumer").
-		SetNickname(username).
-		SetIsAdmin(true).
-		Save(ctx)
-	if err != nil {
-		logx.Errorf("create admin user: %v", err)
-		return
-	}
+		_, err = svcCtx.UsersModelRW.Users.Create().
+			SetID(resp.Id).
+			SetUsername(username).
+			SetPasswordHash(hashedPassword).
+			SetEmail(email).
+			SetPhone("").
+			SetBio("").
+			SetAvatar("").
+			SetCurrentRole("consumer").
+			SetNickname(username).
+			SetIsAdmin(true).
+			Save(ctx)
+		if err != nil {
+			logx.Errorf("create admin user: %v", err)
+			return
+		}
 
-	logx.Infof("initialized admin user: %s", username)
+		logx.Infof("initialized admin user: %s", username)
+	}()
 }