chore: initial commit of ai site platform

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

platform/internal/license/mirror.go

@@ -0,0 +1,87 @@
+package license
+
+import (
+	"context"
+	"database/sql"
+	"fmt"
+	"strings"
+)
+
+// ConsumedMirror 第二持久化（如 Postgres）：leases 目录被删后仍能识别已用过的 id。
+type ConsumedMirror interface {
+	Load(ctx context.Context) (activeID string, ids []string, err error)
+	Save(ctx context.Context, activeID string, ids []string) error
+}
+
+type pgMirror struct {
+	db *sql.DB
+}
+
+func NewPGMirror(db *sql.DB) ConsumedMirror {
+	if db == nil {
+		return nil
+	}
+	return &pgMirror{db: db}
+}
+
+func (p *pgMirror) Load(ctx context.Context) (string, []string, error) {
+	rows, err := p.db.QueryContext(ctx, `
+SELECT lease_id, active FROM platform_meta.license_consumed`)
+	if err != nil {
+		return "", nil, err
+	}
+	defer rows.Close()
+	var active string
+	var ids []string
+	for rows.Next() {
+		var id string
+		var isActive bool
+		if err := rows.Scan(&id, &isActive); err != nil {
+			return "", nil, err
+		}
+		ids = append(ids, id)
+		if isActive {
+			active = id
+		}
+	}
+	return active, ids, rows.Err()
+}
+
+func (p *pgMirror) Save(ctx context.Context, activeID string, ids []string) error {
+	tx, err := p.db.BeginTx(ctx, nil)
+	if err != nil {
+		return err
+	}
+	defer func() { _ = tx.Rollback() }()
+	if _, err := tx.ExecContext(ctx, `DELETE FROM platform_meta.license_consumed`); err != nil {
+		return err
+	}
+	for _, id := range ids {
+		id = trimID(id)
+		if id == "" {
+			continue
+		}
+		_, err := tx.ExecContext(ctx, `
+INSERT INTO platform_meta.license_consumed(lease_id, active, updated_at)
+VALUES ($1, $2, now())
+ON CONFLICT (lease_id) DO UPDATE SET active=EXCLUDED.active, updated_at=now()`,
+			id, id == activeID)
+		if err != nil {
+			return fmt.Errorf("license_consumed upsert: %w", err)
+		}
+	}
+	if activeID != "" {
+		_, err := tx.ExecContext(ctx, `
+INSERT INTO platform_meta.license_consumed(lease_id, active, updated_at)
+VALUES ($1, true, now())
+ON CONFLICT (lease_id) DO UPDATE SET active=true, updated_at=now()`, activeID)
+		if err != nil {
+			return err
+		}
+	}
+	return tx.Commit()
+}
+
+func trimID(s string) string {
+	return strings.TrimSpace(s)
+}