Add secret management guide, client-side performance monitoring, and search accessibility enhancements

- Introduced a comprehensive Secret Management Guide detailing best practices, secret classification, development setup, production management, rotation procedures, and emergency protocols.
- Implemented a client-side performance monitoring script to track various metrics including page load performance, paint metrics, layout shifts, and memory usage.
- Enhanced search accessibility with keyboard navigation support for search results, ensuring compliance with WCAG standards and improving user experience.

tests/test_manual_trigger.py

@@ -1,21 +1,34 @@
 #!/usr/bin/env python3
 """
 Test script for the manual trending content calculation trigger endpoint.
+
+Environment Variables:
+    TEST_ADMIN_USERNAME: Admin username (default: "admin")
+    TEST_ADMIN_PASSWORD: Admin password (required)
+
+Usage:
+    TEST_ADMIN_PASSWORD=your_password python tests/test_manual_trigger.py
 """
 
+import os
 import requests
 import json
 import time
 from datetime import datetime
 
 # Configuration
-BASE_URL = "http://localhost:8000"
-ADMIN_USERNAME = "admin"
-ADMIN_PASSWORD = "admin"  # We'll need to check what the password is
+BASE_URL = os.getenv("TEST_BASE_URL", "http://localhost:8000")
+ADMIN_USERNAME = os.getenv("TEST_ADMIN_USERNAME", "admin")
+ADMIN_PASSWORD = os.getenv("TEST_ADMIN_PASSWORD")
 
 
 def login_and_get_token():
     """Login and get authentication token."""
+    if not ADMIN_PASSWORD:
+        print("❌ Error: TEST_ADMIN_PASSWORD environment variable not set")
+        print("Usage: TEST_ADMIN_PASSWORD=your_password python tests/test_manual_trigger.py")
+        return None
+
     login_url = f"{BASE_URL}/api/v1/auth/login/"
 
     login_data = {