移除管理员数据库模型，改为通过配置管理管理员身份和认证逻辑，并更新相关逻辑和文档

internal/api/admin/auth.go

@@ -2,10 +2,9 @@ package admin
 
 import (
 	"FileRelay/internal/auth"
-	"FileRelay/internal/bootstrap"
+	"FileRelay/internal/config"
 	"FileRelay/internal/model"
 	"net/http"
-	"time"
 
 	"github.com/gin-gonic/gin"
 	"golang.org/x/crypto/bcrypt"
@@ -43,27 +42,24 @@ func (h *AuthHandler) Login(c *gin.Context) {
 		return
 	}
 
-	var admin model.Admin
-	if err := bootstrap.DB.First(&admin).Error; err != nil {
-		c.JSON(http.StatusInternalServerError, model.ErrorResponse(model.CodeInternalError, "Admin not found"))
+	passwordHash := config.GlobalConfig.Security.AdminPasswordHash
+	if passwordHash == "" {
+		c.JSON(http.StatusInternalServerError, model.ErrorResponse(model.CodeInternalError, "Admin password hash not configured"))
 		return
 	}
 
-	if err := bcrypt.CompareHashAndPassword([]byte(admin.PasswordHash), []byte(req.Password)); err != nil {
+	if err := bcrypt.CompareHashAndPassword([]byte(passwordHash), []byte(req.Password)); err != nil {
 		c.JSON(http.StatusUnauthorized, model.ErrorResponse(model.CodeUnauthorized, "Incorrect password"))
 		return
 	}
 
-	token, err := auth.GenerateToken(admin.ID)
+	// 使用固定 ID 1 代表管理员（因为不再有数据库记录）
+	token, err := auth.GenerateToken(1)
 	if err != nil {
 		c.JSON(http.StatusInternalServerError, model.ErrorResponse(model.CodeInternalError, "Failed to generate token"))
 		return
 	}
 
-	// 更新登录时间
-	now := time.Now()
-	bootstrap.DB.Model(&admin).Update("last_login", &now)
-
 	c.JSON(http.StatusOK, model.SuccessResponse(LoginResponse{
 		Token: token,
 	}))