chore: Apply modern Go idioms and perform code cleanup

This commit introduces a series of small refactorings and style fixes across the codebase to improve consistency and leverage modern Go features.

Key changes include:
- Adopting the Go 1.22 `reflect.TypeFor` generic function.
- Replacing `interface{}` with the `any` type alias for better readability.
- Using the explicit `http.NoBody` constant for HTTP requests.
- Updating octal literals for file permissions to the `0o` prefix syntax.
- Standardizing comment formatting and fixing minor typos.
- Removing redundant blank lines and organizing imports.

internal/services/parser.go

@@ -61,7 +61,7 @@ func (p *ArticulateParser) FetchCourse(ctx context.Context, uri string) (*models
 
 	apiURL := p.buildAPIURL(shareID)
 
-	req, err := http.NewRequestWithContext(ctx, http.MethodGet, apiURL, nil)
+	req, err := http.NewRequestWithContext(ctx, http.MethodGet, apiURL, http.NoBody)
 	if err != nil {
 		return nil, fmt.Errorf("failed to create request: %w", err)
 	}

internal/services/parser_bench_test.go

@@ -130,7 +130,7 @@ func BenchmarkArticulateParser_LoadCourseFromFile(b *testing.B) {
 		b.Fatalf("Failed to marshal: %v", err)
 	}
 
-	if err := os.WriteFile(tempFile, data, 0644); err != nil {
+	if err := os.WriteFile(tempFile, data, 0o644); err != nil {
 		b.Fatalf("Failed to write file: %v", err)
 	}
 
@@ -177,7 +177,7 @@ func BenchmarkArticulateParser_LoadCourseFromFile_Large(b *testing.B) {
 		b.Fatalf("Failed to marshal: %v", err)
 	}
 
-	if err := os.WriteFile(tempFile, data, 0644); err != nil {
+	if err := os.WriteFile(tempFile, data, 0o644); err != nil {
 		b.Fatalf("Failed to write file: %v", err)
 	}
 

internal/services/parser_context_test.go

@@ -144,7 +144,7 @@ func TestArticulateParser_FetchCourse_ContextDeadline(t *testing.T) {
 }
 
 // TestArticulateParser_FetchCourse_ContextSuccess tests that FetchCourse
-// succeeds when context is not cancelled.
+// succeeds when context is not canceled.
 func TestArticulateParser_FetchCourse_ContextSuccess(t *testing.T) {
 	testCourse := &models.Course{
 		ShareID: "test-id",
@@ -173,7 +173,6 @@ func TestArticulateParser_FetchCourse_ContextSuccess(t *testing.T) {
 	defer cancel()
 
 	course, err := parser.FetchCourse(ctx, "https://rise.articulate.com/share/test-id")
-
 	if err != nil {
 		t.Fatalf("Expected no error, got: %v", err)
 	}

internal/services/parser_test.go

@@ -209,7 +209,7 @@ func TestArticulateParser_LoadCourseFromFile(t *testing.T) {
 		t.Fatalf("Failed to marshal test course: %v", err)
 	}
 
-	if err := os.WriteFile(tempFile, data, 0644); err != nil {
+	if err := os.WriteFile(tempFile, data, 0o644); err != nil {
 		t.Fatalf("Failed to write test file: %v", err)
 	}
 
@@ -268,7 +268,7 @@ func TestArticulateParser_LoadCourseFromFile_InvalidJSON(t *testing.T) {
 	tempDir := t.TempDir()
 	tempFile := filepath.Join(tempDir, "invalid.json")
 
-	if err := os.WriteFile(tempFile, []byte("invalid json content"), 0644); err != nil {
+	if err := os.WriteFile(tempFile, []byte("invalid json content"), 0o644); err != nil {
 		t.Fatalf("Failed to write test file: %v", err)
 	}