feat: enhance platform independence and integrate ComfyUI lifecycle management

- Added cross-platform process termination in PlatformUtils.
- Improved PathResolver with robust subfolder normalization.
- Integrated ComfyUI lifecycle service (Start/Stop/Restart) using ProcessHandle.
- Updated ComfyUI Bridge with improved UI refresh and sync logic.
- Added comprehensive integration and diagnostic tests.
- Updated documentation with process control details.

src/test/java/de/tki/comfymodels/service/OneClickFixTest.java

@@ -0,0 +1,88 @@
+package de.tki.comfymodels.service;
+
+import de.tki.comfymodels.service.impl.ConfigService;
+import de.tki.comfymodels.service.impl.ComfyLifecycleService;
+import de.tki.comfymodels.service.impl.ComfyDiagnosticService;
+import de.tki.comfymodels.Main;
+import org.junit.jupiter.api.Test;
+import org.springframework.context.annotation.AnnotationConfigApplicationContext;
+import de.tki.comfymodels.Main.AppConfig;
+
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.InputStream;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.nio.file.StandardCopyOption;
+
+public class OneClickFixTest {
+
+    @Test
+    public void performNuclearFix() throws Exception {
+        AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(AppConfig.class);
+        ConfigService configService = context.getBean(ConfigService.class);
+        ComfyLifecycleService lifecycleService = context.getBean(ComfyLifecycleService.class);
+        ComfyDiagnosticService diagnosticService = context.getBean(ComfyDiagnosticService.class);
+        
+        System.out.println("--- ☢️ NUCLEAR ONE-CLICK FIX STARTING ---");
+
+        // 1. Reinstall Bridge to the correct location
+        String comfyPath = "C:\\AI\\ComfyUI\\resources\\ComfyUI";
+        Path bridgeDir = Paths.get(comfyPath, "custom_nodes", "comfyui-model-downloader");
+        System.out.println("📦 Reinstalling Bridge to: " + bridgeDir);
+        Files.createDirectories(bridgeDir);
+        Files.createDirectories(bridgeDir.resolve("web"));
+        
+        copyResource("/comfyui-bridge/__init__.py", bridgeDir.resolve("__init__.py"));
+        copyResource("/comfyui-bridge/web/downloader.js", bridgeDir.resolve("web/downloader.js"));
+        
+        String configJson = "{\"token\": \"" + configService.getApiToken() + "\"}";
+        Files.writeString(bridgeDir.resolve("web/config.json"), configJson);
+        System.out.println("✅ Bridge reinstalled.");
+
+        // 2. Kill existing process
+        System.out.println("⏹ Stopping ComfyUI...");
+        lifecycleService.stop(); 
+        // Fallback kill for PID 14544 just in case
+        Runtime.getRuntime().exec("taskkill /F /PID 14544").waitFor();
+        System.out.println("✅ ComfyUI stopped.");
+
+        // 3. Start via Lifecycle Service
+        System.out.println("▶ Starting ComfyUI...");
+        lifecycleService.start();
+        
+        // 4. Wait for Health
+        System.out.println("⏳ Waiting for API to become healthy...");
+        boolean healthy = false;
+        for (int i = 0; i < 60; i++) {
+            if (lifecycleService.isHealthy()) {
+                healthy = true;
+                break;
+            }
+            Thread.sleep(1000);
+        }
+        
+        if (healthy) {
+            System.out.println("✅ ComfyUI is back online!");
+            
+            // 5. Final Diagnostic
+            String model = "ltx2.3-transition.safetensors";
+            if (diagnosticService.isModelAvailableInComfy(model, "loras")) {
+                System.out.println("🎯 TARGET VERIFIED: '" + model + "' is now fully recognized!");
+            } else {
+                System.out.println("❌ Diagnostic failed even after restart. Please check if the file is in 'models/loras'.");
+            }
+        } else {
+            System.out.println("❌ ComfyUI failed to start within 60 seconds.");
+        }
+
+        context.close();
+    }
+
+    private void copyResource(String name, Path target) throws Exception {
+        try (InputStream is = getClass().getResourceAsStream(name)) {
+            Files.copy(is, target, StandardCopyOption.REPLACE_EXISTING);
+        }
+    }
+}