Initial open-source release (MIT): image2api AI gateway

Full Go backend + Vue 3 frontend, OpenAI-compatible API, multi-provider
account pools, billing/admin, Docker one-command deploy with auto HTTPS.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

backend/internal/repo/api_key_repo.go

@@ -0,0 +1,53 @@
+package repo
+
+import (
+	"context"
+	"time"
+
+	"backend/internal/model"
+	"gorm.io/gorm"
+)
+
+type APIKeyRepository struct {
+	db *gorm.DB
+}
+
+func NewAPIKeyRepository(db *gorm.DB) *APIKeyRepository {
+	return &APIKeyRepository{db: db}
+}
+
+func (r *APIKeyRepository) ListByUserID(ctx context.Context, userID string) ([]model.APIKey, error) {
+	var keys []model.APIKey
+	if err := r.db.WithContext(ctx).Where("user_id = ?", userID).Order("created_at asc").Find(&keys).Error; err != nil {
+		return nil, err
+	}
+	return keys, nil
+}
+
+func (r *APIKeyRepository) ReplaceForUser(ctx context.Context, userID string, key *model.APIKey) error {
+	return r.db.WithContext(ctx).Transaction(func(tx *gorm.DB) error {
+		if err := tx.Where("user_id = ?", userID).Delete(&model.APIKey{}).Error; err != nil {
+			return err
+		}
+		return tx.Create(key).Error
+	})
+}
+
+func (r *APIKeyRepository) DeleteByUserID(ctx context.Context, userID string) error {
+	return r.db.WithContext(ctx).Where("user_id = ?", userID).Delete(&model.APIKey{}).Error
+}
+
+func (r *APIKeyRepository) DeleteByID(ctx context.Context, userID, keyID string) error {
+	return r.db.WithContext(ctx).
+		Where("user_id = ? AND id = ?", userID, keyID).
+		Delete(&model.APIKey{}).Error
+}
+
+func (r *APIKeyRepository) Create(ctx context.Context, key *model.APIKey) error {
+	return r.db.WithContext(ctx).Create(key).Error
+}
+
+func (r *APIKeyRepository) TouchUsage(ctx context.Context, keyHash string) error {
+	now := time.Now()
+	return r.db.WithContext(ctx).Model(&model.APIKey{}).Where("key_hash = ?", keyHash).Update("last_used_at", now).Error
+}