fix: default baseUrl/version if omitted (#267)

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**Motivation:**
<!--
Explain here the context, and why you're making that change. What is the
problem you're trying to solve.
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As a devkit user, I want to be able to select a new template version
without selecting a new template baseUrl

**Modifications:**
<!--
Describe the modifications you've done from a high level. What are the
key technical decisions and why were they made?
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- Defaults `baseUrl`/`version` if either are missing

**Result:**
<!--
*After your change, what will change.
-->
- `devkit avs create --template-version="v0.0.24" ./` works as expected

Author: grezle

pkg/commands/create.go

@@ -215,22 +215,30 @@ func getTemplateURLs(cCtx *cli.Context) (string, string, string, error) {
 	version := cCtx.String("template-version")
 	lang := cCtx.String("lang")
 
-	// If no overrides provided, get from config
-	if baseURL == "" && version == "" {
+	// If overrides are omitted, get from config
+	if baseURL == "" || version == "" {
 		cfg, err := template.LoadConfig()
 		if err != nil {
 			return "", "", "", fmt.Errorf("failed to load templates cfg: %w", err)
 		}
 
 		selectedTemplate := cCtx.String("template")
-		baseURL, version, err = template.GetTemplateURLs(cfg, selectedTemplate, lang)
+		defaultBaseURL, defaultVersion, err := template.GetTemplateURLs(cfg, selectedTemplate, lang)
 		if err != nil {
 			return "", "", "", fmt.Errorf("failed to get template URLs: %w", err)
 		}
 
-		if baseURL == "" {
+		if defaultBaseURL == "" {
 			return "", "", "", fmt.Errorf("no template found for template %s and language %s", selectedTemplate, lang)
 		}
+
+		// If no baseUrl/version is provided use template defaults
+		if baseURL == "" {
+			baseURL = defaultBaseURL
+		}
+		if version == "" {
+			version = defaultVersion
+		}
 	}
 
 	return baseURL, version, lang, nil