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/tests/e2e/README.md

@@ -14,16 +14,6 @@ uv pip install -r requirements.txt
 playwright install
 ```
 
-3. Create test fixtures:
-```bash
-mkdir -p tests/fixtures
-```
-
-4. Add test assets:
-Place the following files in `tests/fixtures/`:
-- `test_photo.jpg` - A sample photo for testing uploads
-- `test_avatar.jpg` - A sample avatar image for profile tests
-
 ## Running Tests
 
 ### Run all tests:
@@ -86,6 +76,21 @@ You can create these users using Django management commands:
 python manage.py create_test_users
 ```
 
+## Test Images
+
+Tests that require file uploads use the `test_images` fixture defined in `conftest.py`. This fixture generates temporary JPEG images at runtime, eliminating the need for external fixture files.
+
+Usage in tests:
+```python
+def test_add_photo(page: Page, test_images):
+    page.get_by_label("Photo").set_input_files(test_images["test_photo"])
+    page.get_by_label("Avatar").set_input_files(test_images["test_avatar"])
+```
+
+Available keys:
+- `test_images["test_photo"]` - Path to a temporary test photo
+- `test_images["test_avatar"]` - Path to a temporary test avatar
+
 ## Test Environment
 
 Tests expect:
@@ -104,8 +109,7 @@ Tests expect:
 
 1. **Connection Refused**: Ensure Django server is running
 2. **Element Not Found**: Check selectors and page load timing
-3. **Upload Failures**: Verify test fixtures exist
-4. **Authentication Errors**: Verify test users exist in database
+3. **Authentication Errors**: Verify test users exist in database
 
 ## Contributing