feat: add version display to CLI banner and WebUI

- Add getPackageVersion() utility function in src/utils/helpers.js
- Display version in CLI startup banner (e.g., "v2.4.2")
- Display version in WebUI navbar next to "CLAUDE PROXY SYSTEM"
- Refactor WebUI to use shared getPackageVersion() utility
- Update footer with GitHub icon and link

src/utils/helpers.js

@@ -1,9 +1,30 @@
+import { readFileSync } from 'fs';
+import { fileURLToPath } from 'url';
+import path from 'path';
+
 /**
  * Shared Utility Functions
  *
  * General-purpose helper functions used across multiple modules.
  */
 
+/**
+ * Get the package version from package.json
+ * @param {string} [defaultVersion='1.0.0'] - Default version if package.json cannot be read
+ * @returns {string} The package version
+ */
+export function getPackageVersion(defaultVersion = '1.0.0') {
+    try {
+        const __filename = fileURLToPath(import.meta.url);
+        const __dirname = path.dirname(__filename);
+        const packageJsonPath = path.join(__dirname, '../../package.json');
+        const packageJson = JSON.parse(readFileSync(packageJsonPath, 'utf8'));
+        return packageJson.version || defaultVersion;
+    } catch {
+        return defaultVersion;
+    }
+}
+
 /**
  * Format duration in milliseconds to human-readable string
  * @param {number} ms - Duration in milliseconds