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.

backend/scripts/generate_requirements.sh

@@ -0,0 +1,29 @@
+#!/bin/bash
+# Generate requirements.txt files from pyproject.toml
+# Usage: ./scripts/generate_requirements.sh
+
+set -e
+
+cd "$(dirname "$0")/.."
+
+echo "Generating requirements files from pyproject.toml..."
+
+# Generate production requirements
+echo "  → requirements.txt (production)"
+uv pip compile pyproject.toml -o requirements.txt --no-deps
+
+# Generate development requirements
+echo "  → requirements-dev.txt (development)"
+uv pip compile pyproject.toml -o requirements-dev.txt --group dev
+
+# Generate test requirements
+echo "  → requirements-test.txt (testing)"
+uv pip compile pyproject.toml -o requirements-test.txt --group test
+
+echo ""
+echo "Requirements files generated successfully!"
+echo ""
+echo "Files created:"
+echo "  - requirements.txt      (production dependencies)"
+echo "  - requirements-dev.txt  (development dependencies)"
+echo "  - requirements-test.txt (test dependencies)"