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>

models/db.go

@@ -0,0 +1,111 @@
+package model
+
+import (
+	"fmt"
+	"log"
+	"os"
+	"path/filepath"
+
+	"github.com/glebarez/sqlite" // 纯 Go，支持 CGO_ENABLED=0 交叉编译
+	"gorm.io/gorm"
+	"gorm.io/gorm/logger"
+)
+
+var DB *gorm.DB
+
+// InitDB 初始化 SQLite 并自动迁移
+func InitDB(dbPath string) error {
+	dir := filepath.Dir(dbPath)
+	if err := os.MkdirAll(dir, 0755); err != nil {
+		return fmt.Errorf("创建数据库目录失败: %w", err)
+	}
+
+	db, err := gorm.Open(sqlite.Open(dbPath), &gorm.Config{
+		Logger: logger.Default.LogMode(logger.Warn),
+	})
+	if err != nil {
+		return fmt.Errorf("连接 SQLite 失败: %w", err)
+	}
+
+	sqlDB, err := db.DB()
+	if err != nil {
+		return err
+	}
+	sqlDB.SetMaxOpenConns(1)
+
+	if err := db.AutoMigrate(
+		&User{}, &Board{}, &Post{}, &Comment{},
+		&PostLike{}, &CommentLike{}, &PostFavorite{}, &PostRevision{}, &CommentRevision{}, &ForumSetting{},
+		&OAuthClient{}, &OAuthAuthCode{},
+		&GiteaRepo{},
+		&PrivateMessage{}, &PostReport{}, &FriendLinkApply{},
+		&Media{},
+		&PointLedger{}, &CheckIn{}, &LotteryDraw{}, &PostContentUnlock{},
+		&BadgeDef{}, &UserBadge{},
+		&SitePage{}, &Poll{}, &PollOption{}, &PollVote{}, &PostLotteryWinner{},
+	); err != nil {
+		return fmt.Errorf("自动迁移失败: %w", err)
+	}
+
+	// 存量数据默认视为已公开，避免升级后内容全部进入待审
+	_ = db.Model(&Post{}).Where("status = '' OR status IS NULL").Update("status", ContentStatusPublished).Error
+	_ = db.Model(&Comment{}).Where("status = '' OR status IS NULL").Update("status", ContentStatusPublished).Error
+	_ = db.Model(&Post{}).Where("post_type = '' OR post_type IS NULL").Update("post_type", PostTypeNormal).Error
+
+	DB = db
+	seedDefaultBadges(db)
+	backfillUserExp(db)
+	log.Println("[model] SQLite 数据库初始化完成:", dbPath)
+	return nil
+}
+
+// PingDB 检测数据库连接是否可用（供健康检查使用）
+func PingDB() error {
+	if DB == nil {
+		return fmt.Errorf("数据库未初始化")
+	}
+	sqlDB, err := DB.DB()
+	if err != nil {
+		return err
+	}
+	return sqlDB.Ping()
+}
+
+// seedDefaultBadges 写入内置自动徽章（已存在则跳过）
+func seedDefaultBadges(db *gorm.DB) {
+	defs := []BadgeDef{
+		{Code: "tenure_30", Name: "初来乍到", Description: "注册满 30 天", Icon: "calendar", Kind: BadgeKindAuto, Metric: BadgeMetricTenureDays, Threshold: 30, SortOrder: 10, Enabled: true},
+		{Code: "tenure_365", Name: "资深居民", Description: "注册满 365 天", Icon: "calendar-heart", Kind: BadgeKindAuto, Metric: BadgeMetricTenureDays, Threshold: 365, SortOrder: 20, Enabled: true},
+		{Code: "likes_10", Name: "小有人气", Description: "帖子获赞累计 10", Icon: "heart", Kind: BadgeKindAuto, Metric: BadgeMetricLikesReceived, Threshold: 10, SortOrder: 30, Enabled: true},
+		{Code: "likes_100", Name: "人气作者", Description: "帖子获赞累计 100", Icon: "heart-handshake", Kind: BadgeKindAuto, Metric: BadgeMetricLikesReceived, Threshold: 100, SortOrder: 40, Enabled: true},
+		{Code: "likes_1000", Name: "人气巨星", Description: "帖子获赞累计 1000", Icon: "flame", Kind: BadgeKindAuto, Metric: BadgeMetricLikesReceived, Threshold: 1000, SortOrder: 50, Enabled: true},
+		{Code: "income_100", Name: "小有进账", Description: "创作分成累计 100 积分", Icon: "coins", Kind: BadgeKindAuto, Metric: BadgeMetricCreatorIncome, Threshold: 100, SortOrder: 60, Enabled: true},
+		{Code: "income_1000", Name: "创作达人", Description: "创作分成累计 1000 积分", Icon: "gem", Kind: BadgeKindAuto, Metric: BadgeMetricCreatorIncome, Threshold: 1000, SortOrder: 70, Enabled: true},
+	}
+	for _, d := range defs {
+		var n int64
+		db.Model(&BadgeDef{}).Where("code = ?", d.Code).Count(&n)
+		if n == 0 {
+			_ = db.Create(&d).Error
+		}
+	}
+}
+
+// backfillUserExp 对 Exp 仍为 0 的用户按存量公开内容粗算经验（仅补一次量级）
+func backfillUserExp(db *gorm.DB) {
+	var users []User
+	if err := db.Select("id", "exp").Where("exp = 0").Find(&users).Error; err != nil {
+		return
+	}
+	for _, u := range users {
+		var posts, comments int64
+		var likeSum int64
+		_ = db.Model(&Post{}).Where("user_id = ? AND status = ?", u.ID, ContentStatusPublished).Count(&posts).Error
+		_ = db.Model(&Comment{}).Where("user_id = ? AND status = ?", u.ID, ContentStatusPublished).Count(&comments).Error
+		_ = db.Model(&Post{}).Select("COALESCE(SUM(like_count), 0)").Where("user_id = ? AND status = ?", u.ID, ContentStatusPublished).Scan(&likeSum).Error
+		exp := int(posts)*10 + int(comments)*2 + int(likeSum)
+		if exp > 0 {
+			_ = db.Model(&User{}).Where("id = ? AND exp = 0", u.ID).Update("exp", exp).Error
+		}
+	}
+}