支持板块图标与主题色自定义，并优化列表加载与未保存离开提示。

新增后端图标校验与色槽规范化，前端展示 BoardBadge/骨架屏，发帖与板块管理页增加未保存确认。

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

service/board.go

@@ -45,14 +45,24 @@ func (s *BoardService) GetByID(id uint) (*model.Board, error) {
 	return &board, nil
 }
 
-func (s *BoardService) Create(name, desc string, sortOrder int) (*model.Board, error) {
-	board := &model.Board{Name: name, Description: desc, SortOrder: sortOrder}
+func (s *BoardService) Create(name, desc, icon string, colorIndex, sortOrder int) (*model.Board, error) {
+	board := &model.Board{
+		Name:        name,
+		Description: desc,
+		Icon:        NormalizeBoardIcon(icon),
+		ColorIndex:  NormalizeBoardColorIndex(colorIndex),
+		SortOrder:   sortOrder,
+	}
 	return board, model.DB.Create(board).Error
 }
 
-func (s *BoardService) Update(id uint, name, desc string, sortOrder int) error {
+func (s *BoardService) Update(id uint, name, desc, icon string, colorIndex, sortOrder int) error {
 	return model.DB.Model(&model.Board{}).Where("id = ?", id).Updates(map[string]interface{}{
-		"name": name, "description": desc, "sort_order": sortOrder,
+		"name":         name,
+		"description":  desc,
+		"icon":         NormalizeBoardIcon(icon),
+		"color_index":  NormalizeBoardColorIndex(colorIndex),
+		"sort_order":   sortOrder,
 	}).Error
 }
 

service/board_icon.go

@@ -0,0 +1,36 @@
+package service
+
+import "strings"
+
+// AllowedBoardIcons 与前端 BOARD_ICON_OPTIONS 的 key 保持一致
+var AllowedBoardIcons = map[string]struct{}{
+	"code-2": {}, "coffee": {}, "help-circle": {}, "message-square": {},
+	"lightbulb": {}, "book-open": {}, "gamepad-2": {}, "palette": {},
+	"music": {}, "camera": {}, "heart": {}, "zap": {},
+	"globe": {}, "users": {}, "briefcase": {}, "graduation-cap": {},
+	"shopping-bag": {}, "map-pin": {}, "megaphone": {}, "flame": {},
+	"star": {}, "folder": {}, "wrench": {}, "cpu": {},
+}
+
+// NormalizeBoardIcon 校验并规范化板块图标 key，非法或空则返回空串
+func NormalizeBoardIcon(icon string) string {
+	icon = strings.TrimSpace(strings.ToLower(icon))
+	if icon == "" {
+		return ""
+	}
+	if _, ok := AllowedBoardIcons[icon]; !ok {
+		return ""
+	}
+	return icon
+}
+
+// NormalizeBoardColorIndex -1 表示自动；0–7 为有效色槽
+func NormalizeBoardColorIndex(colorIndex int) int {
+	if colorIndex < 0 {
+		return -1
+	}
+	if colorIndex > 7 {
+		return colorIndex % 8
+	}
+	return colorIndex
+}