refactor: Gitea 式目录改组，移除本分支 SPA 与杂项产物

将 model/service/handler/middleware 迁至 models/services/routers/api/modules/auth，并删除 frontend、embed_static、scripts 及误入库缓存/二进制。

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

services/board.go

@@ -0,0 +1,87 @@
+package service
+
+import (
+	"errors"
+
+	"git.iioio.com/freefire/jiang13-forum/model"
+)
+
+type BoardService struct{}
+
+func NewBoardService() *BoardService {
+	return &BoardService{}
+}
+
+// BoardWithStats 板块及帖子数量
+type BoardWithStats struct {
+	model.Board
+	PostCount int `json:"post_count"`
+}
+
+func (s *BoardService) List() ([]model.Board, error) {
+	var boards []model.Board
+	err := model.DB.Order("sort_order asc, id asc").Find(&boards).Error
+	return boards, err
+}
+
+func (s *BoardService) ListWithStats() ([]BoardWithStats, error) {
+	boards, err := s.List()
+	if err != nil {
+		return nil, err
+	}
+	result := make([]BoardWithStats, len(boards))
+	for i, b := range boards {
+		var count int64
+		model.DB.Model(&model.Post{}).
+			Where("board_id = ? AND status = ?", b.ID, model.ContentStatusPublished).
+			Count(&count)
+		result[i] = BoardWithStats{Board: b, PostCount: int(count)}
+	}
+	return result, nil
+}
+func (s *BoardService) GetByID(id uint) (*model.Board, error) {
+	var board model.Board
+	if err := model.DB.First(&board, id).Error; err != nil {
+		return nil, ErrBoardNotFound
+	}
+	return &board, nil
+}
+
+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, icon string, colorIndex, sortOrder int) error {
+	return model.DB.Model(&model.Board{}).Where("id = ?", id).Updates(map[string]interface{}{
+		"name":         name,
+		"description":  desc,
+		"icon":         NormalizeBoardIcon(icon),
+		"color_index":  NormalizeBoardColorIndex(colorIndex),
+		"sort_order":   sortOrder,
+	}).Error
+}
+
+func (s *BoardService) Delete(id uint) error {
+	var count int64
+	model.DB.Model(&model.Post{}).Where("board_id = ?", id).Count(&count)
+	if count > 0 {
+		return errors.New("该板块下还有帖子，无法删除")
+	}
+	return model.DB.Delete(&model.Board{}, id).Error
+}
+
+// EnsureDefaultBoard 若尚无板块则创建默认「综合讨论」，便于全新安装后直接发帖
+func (s *BoardService) EnsureDefaultBoard() {
+	var n int64
+	if err := model.DB.Model(&model.Board{}).Count(&n).Error; err != nil || n > 0 {
+		return
+	}
+	_, _ = s.Create("综合讨论", "默认板块，欢迎发帖交流", "message-square", 0, 0)
+}