refactor: 拆分超标控制器文件至行数≤120行

- auth_controller.go(238→54): 拆出auth_api_login.go(107)+auth_api_register.go(96)
- settings_controller.go(289→101): 拆出settings_api_profile(116)+account(59)+error_handlers(41)
- message_controller.go(129→85): 拆出message_page_controller.go(55)
- 所有拆分后文件均≤120行，符合code-style.md瘦控制器规范

internal/controller/message_page_controller.go

@@ -0,0 +1,55 @@
+package controller
+
+import (
+	"net/http"
+	"strconv"
+
+	"metazone.cc/metalab/internal/common"
+	"metazone.cc/metalab/internal/model"
+
+	"github.com/gin-gonic/gin"
+)
+
+// MessagesPage 消息中心页面（需登录，noindex）
+func (mc *MessageController) MessagesPage(c *gin.Context) {
+	uidVal, exists := c.Get("uid")
+	if !exists {
+		c.Redirect(http.StatusFound, "/auth/login")
+		c.Abort()
+		return
+	}
+	uid := uidVal.(uint)
+
+	// 从 query 取分页参数
+	page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
+	if page < 1 {
+		page = 1
+	}
+	pageSize := 20
+
+	result, err := mc.notifService.List(uid, page, pageSize)
+	if err != nil {
+		result = &model.NotificationListResult{Items: []model.Notification{}, Total: 0, Page: 1}
+	}
+
+	totalPages := result.TotalPages
+	if totalPages == 0 && result.Total > 0 {
+		totalPages = int((result.Total + int64(pageSize) - 1) / int64(pageSize))
+	}
+
+	c.HTML(http.StatusOK, "messages/index.html", common.BuildPageData(c, gin.H{
+		"Title":           "消息中心",
+		"ExtraCSS":        "/static/css/messages.css",
+		"Messages":        result.Items,
+		"Total":           result.Total,
+		"Page":            result.Page,
+		"TotalPages":      totalPages,
+		"PrevPage":        result.Page - 1,
+		"NextPage":        result.Page + 1,
+		"HasPrev":         result.Page > 1,
+		"HasNext":         result.Page < totalPages,
+		"UnreadCount":     result.Unread,
+		"NotifyTypeNames": model.NotifyTypeNames,
+		"AuditTypeNames":  model.AuditTypeNames,
+	}))
+}