feat: CI/CD pipeline + Learning/Medicine/Travel services

- Add Gitea Actions workflow for automated build & deploy
- Add K8s manifests: webui, travel-svc, medicine-svc, sandbox-svc
- Update kustomization for localhost:5000 registry
- Add ingress for gooseek.ru and api.gooseek.ru
- Learning cabinet with onboarding, courses, sandbox integration
- Medicine service with symptom analysis and doctor matching
- Travel service with itinerary planning
- Server setup scripts (NVIDIA/CUDA, K3s, Gitea runner)

Made-with: Cursor

backend/pkg/storage/minio.go

@@ -20,11 +20,13 @@ type MinioConfig struct {
 	SecretKey string
 	Bucket    string
 	UseSSL    bool
+	PublicURL string
 }
 
 type MinioStorage struct {
-	client *minio.Client
-	bucket string
+	client    *minio.Client
+	bucket    string
+	publicURL string
 }
 
 type UploadResult struct {
@@ -57,11 +59,23 @@ func NewMinioStorage(cfg MinioConfig) (*MinioStorage, error) {
 	}
 
 	return &MinioStorage{
-		client: client,
-		bucket: cfg.Bucket,
+		client:    client,
+		bucket:    cfg.Bucket,
+		publicURL: strings.TrimRight(cfg.PublicURL, "/"),
 	}, nil
 }
 
+func (s *MinioStorage) GetPublicURL(key string) string {
+	if s.publicURL != "" {
+		return s.publicURL + "/" + s.bucket + "/" + key
+	}
+	return ""
+}
+
+func (s *MinioStorage) Bucket() string {
+	return s.bucket
+}
+
 func (s *MinioStorage) Upload(ctx context.Context, reader io.Reader, size int64, filename, contentType string) (*UploadResult, error) {
 	ext := filepath.Ext(filename)
 	key := generateStorageKey(ext)
@@ -83,6 +97,25 @@ func (s *MinioStorage) Upload(ctx context.Context, reader io.Reader, size int64,
 	}, nil
 }
 
+func (s *MinioStorage) UploadWithKey(ctx context.Context, key string, reader io.Reader, size int64, contentType string) (*UploadResult, error) {
+	opts := minio.PutObjectOptions{
+		ContentType:  contentType,
+		CacheControl: "public, max-age=2592000",
+	}
+
+	info, err := s.client.PutObject(ctx, s.bucket, key, reader, size, opts)
+	if err != nil {
+		return nil, fmt.Errorf("failed to upload file: %w", err)
+	}
+
+	return &UploadResult{
+		Key:    key,
+		Bucket: s.bucket,
+		Size:   info.Size,
+		ETag:   info.ETag,
+	}, nil
+}
+
 func (s *MinioStorage) UploadUserFile(ctx context.Context, userID string, reader io.Reader, size int64, filename, contentType string) (*UploadResult, error) {
 	ext := filepath.Ext(filename)
 	key := fmt.Sprintf("users/%s/%s%s", userID, uuid.New().String(), ext)