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/internal/learning/mock_llm_test.go

@@ -0,0 +1,36 @@
+package learning
+
+import (
+	"context"
+
+	"github.com/gooseek/backend/internal/llm"
+)
+
+type mockLLMClient struct {
+	generateFunc func(ctx context.Context, req llm.StreamRequest) (string, error)
+	streamFunc   func(ctx context.Context, req llm.StreamRequest) (<-chan llm.StreamChunk, error)
+}
+
+func (m *mockLLMClient) StreamText(ctx context.Context, req llm.StreamRequest) (<-chan llm.StreamChunk, error) {
+	if m.streamFunc != nil {
+		return m.streamFunc(ctx, req)
+	}
+	ch := make(chan llm.StreamChunk)
+	close(ch)
+	return ch, nil
+}
+
+func (m *mockLLMClient) GenerateText(ctx context.Context, req llm.StreamRequest) (string, error) {
+	if m.generateFunc != nil {
+		return m.generateFunc(ctx, req)
+	}
+	return "", nil
+}
+
+func (m *mockLLMClient) GetProviderID() string {
+	return "mock"
+}
+
+func (m *mockLLMClient) GetModelKey() string {
+	return "mock-model"
+}