feat: load and cache Ollama show data per model with clickable model details

- Add GET /api/v1/models/{model_name}/show endpoint (proxy to Ollama /api/show)
- Worker now fetches show data for each model during model list sync
- Persist show details in localStorage under llm_monitor_models.showByModel
- Make model cards clickable to display cached show details in a dedicated panel
- Keep UI updates incremental without full page reload
- Add tests for show endpoint and OpenAPI path
- Update README and PRD with show-flow and click-card behavior

app/web/templates/index.html

@@ -77,6 +77,15 @@
                     </div>
                 </div>
 
+                <!-- Model Show Details -->
+                <div id="model-details-section" class="mt-8 bg-gray-800 rounded-lg border border-gray-700 p-6 hidden">
+                    <div class="flex items-center justify-between mb-4">
+                        <h3 class="text-lg font-bold">Dettagli Modello</h3>
+                        <span id="model-details-name" class="text-sm text-purple-300 font-medium"></span>
+                    </div>
+                    <pre id="model-details-content" class="bg-gray-900 text-gray-200 text-xs p-4 rounded-lg overflow-auto max-h-96 whitespace-pre-wrap"></pre>
+                </div>
+
                 <!-- API Documentation Section -->
                 <div class="mt-8 bg-blue-900 bg-opacity-20 border border-blue-700 rounded-lg p-6">
                     <h3 class="text-lg font-bold mb-4">📚 Documentazione API</h3>