fix: Prevent nodemon restarts during policy creation

- Move temp directory outside app folder to /tmp/minio-webui-temp
- Add nodemon.json to ignore temp, logs, and node_modules
- Add TEMP_DIR environment variable configuration
- Add cleanup routine for old temporary policy files (>1 hour)
- Update both dev and production Dockerfiles
- Update docker-compose configurations

This fixes the 500 error during QuickStartWizard policy creation
caused by nodemon restarting when temporary files were created.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

backend/nodemon.json

@@ -0,0 +1,14 @@
+{
+  "watch": ["src"],
+  "ext": "js,json",
+  "ignore": [
+    "src/**/*.spec.js",
+    "node_modules",
+    "logs",
+    "temp",
+    "*.log",
+    "*.tmp",
+    "*.temp"
+  ],
+  "delay": "1000"
+}

backend/src/services/minio.service.js

@@ -19,11 +19,34 @@ class MinIOService {
   async ensureTempDir() {
     try {
       await fs.mkdir(this.tempDir, { recursive: true });
+      // Clean up old temp files (older than 1 hour)
+      this.cleanupTempFiles();
     } catch (error) {
       logger.error('Failed to create temp directory:', error);
     }
   }
 
+  async cleanupTempFiles() {
+    try {
+      const files = await fs.readdir(this.tempDir);
+      const now = Date.now();
+      const oneHour = 60 * 60 * 1000;
+
+      for (const file of files) {
+        if (file.endsWith('.json')) {
+          const filePath = path.join(this.tempDir, file);
+          const stats = await fs.stat(filePath);
+          if (now - stats.mtimeMs > oneHour) {
+            await fs.unlink(filePath);
+            logger.debug(`Cleaned up old temp file: ${file}`);
+          }
+        }
+      }
+    } catch (error) {
+      logger.debug('Error cleaning temp files:', error);
+    }
+  }
+
   // Execute MinIO CLI command with timeout and error handling
   async executeCommand(command, options = {}) {
     const { timeout = 30000, parseJson = false } = options;