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.

docs/admin/CHANGELOG.md

@@ -0,0 +1,138 @@
+# Admin Interface Changelog
+
+## Phase 11: Django Admin Standardization
+
+### Added
+
+- **Base Admin Classes and Mixins** (`apps/core/admin/`)
+  - `BaseModelAdmin` - Standard base class with consistent pagination and settings
+  - `QueryOptimizationMixin` - Automatic select_related/prefetch_related optimization
+  - `ReadOnlyAdminMixin` - Disable modifications for auto-generated data
+  - `TimestampFieldsMixin` - Standard handling for created_at/updated_at
+  - `SlugFieldMixin` - Automatic slug prepopulation
+  - `ExportActionMixin` - CSV/JSON export functionality
+  - `BulkStatusChangeMixin` - Bulk status change actions
+  - `ModerationMixin` - Standard moderation approve/reject actions
+
+- **Query Optimization Across All Admin Classes**
+  - `list_select_related` for all ForeignKey fields in list_display
+  - `list_prefetch_related` for reverse relations and M2M fields
+  - Queryset annotations for calculated fields (ride counts, average ratings)
+
+- **Custom Bulk Actions**
+  - Parks: `bulk_activate`, `bulk_deactivate`, `recalculate_stats`
+  - Rides: `bulk_set_operating`, `bulk_set_closed`, `bulk_set_sbno`, `recalculate_ratings`
+  - Accounts: `activate_users`, `deactivate_users`, `ban_users`, `unban_users`, `send_verification_email`, `recalculate_credits`
+  - Reviews: `bulk_approve`, `bulk_reject`, `flag_for_review`
+  - Moderation: `bulk_approve`, `bulk_reject`, `bulk_escalate`
+  - Photos: `set_primary`, `remove_primary`, `flag_missing_alt`
+  - Tokens: `resend_verification`, `delete_expired`, `cleanup_old_tokens`
+  - Lists: `publish_lists`, `unpublish_lists`, `move_up`, `move_down`
+
+- **Export Functionality**
+  - CSV export for all major models
+  - JSON export for all major models
+  - Audit trail export for state logs
+  - SEO redirect export for slug history
+
+- **Enhanced Display Methods**
+  - Color-coded status badges for all status fields
+  - Clickable links to related objects in list views
+  - Rating displays with star formatting
+  - Thumbnail previews for images
+  - Profile completeness indicators
+  - Moderation status indicators
+
+- **Comprehensive Fieldsets**
+  - Standardized fieldset organization across all admins
+  - Collapsible sections for advanced/metadata fields
+  - Descriptive help text for all fieldsets
+
+- **Documentation**
+  - `docs/admin/base_classes.md` - Base admin architecture documentation
+  - `docs/admin/CHANGELOG.md` - This changelog
+
+- **Test Coverage**
+  - `apps/core/tests/test_admin.py` - Tests for base classes and mixins
+  - `apps/parks/tests/test_admin.py` - Tests for parks admin
+  - `apps/rides/tests/test_admin.py` - Tests for rides admin
+  - `apps/accounts/tests/test_admin.py` - Tests for accounts admin
+  - `apps/moderation/tests/test_admin.py` - Tests for moderation admin
+
+### Changed
+
+- **Parks Admin** (`apps/parks/admin.py`)
+  - Optimized all querysets with select_related/prefetch_related
+  - Added ride count and average rating annotations
+  - Enhanced list_display with clickable links
+  - Added autocomplete_fields for ForeignKeys
+  - Standardized fieldsets with descriptions
+
+- **Rides Admin** (`apps/rides/admin.py`)
+  - Optimized all querysets with select_related/prefetch_related
+  - Added review count and average rating annotations
+  - Enhanced category and status badges with color coding
+  - Added FSM-aware status change actions
+  - Maintained read-only status for rankings
+
+- **Accounts Admin** (`apps/accounts/admin.py`)
+  - Optimized user queryset with profile select_related
+  - Added total credits display with breakdown tooltip
+  - Enhanced user status badge display
+  - Added profile completeness indicator
+  - Added social media presence indicator
+
+- **Core Admin** (`apps/core/admin.py`)
+  - Enhanced SlugHistory with content type display
+  - Added admin URL linking for related objects
+  - Added SEO export functionality
+
+- **Media Admin** (`shared/media/admin.py`)
+  - Enhanced thumbnail preview with lazy loading
+  - Added alt text validation warnings
+  - Added primary photo management actions
+
+- **Moderation Admin** (`apps/moderation/admin.py`)
+  - Enhanced dashboard with pending counts
+  - Added changes preview formatting
+  - Enhanced state log display with badges
+  - Added audit trail export
+
+### Fixed
+
+- N+1 query issues in all admin list views
+- Inconsistent permission handling across admins
+- Missing help text on admin fields
+- Content object link errors when objects are deleted
+
+### Removed
+
+- Duplicate admin file at `apps/accounts/admin.py` (root level)
+- Redundant code patterns replaced by mixins
+
+### Performance Improvements
+
+- **Query Optimization**
+  - Parks list view: Reduced from ~50+ queries to <10 queries
+  - Rides list view: Reduced from ~100+ queries to <15 queries
+  - User list view: Reduced from ~30+ queries to <10 queries
+  - Moderation views: Reduced from ~40+ queries to <12 queries
+
+- **Page Settings**
+  - Consistent pagination at 50 items per page
+  - Disabled full result count for large datasets
+  - Added date hierarchy for time-based filtering
+
+### Security Enhancements
+
+- Standardized read-only permissions for auto-generated data
+- Superuser-only delete permissions for audit logs
+- Self-protection in user ban/deactivate actions
+- FSM validation in status change actions
+
+### Developer Experience
+
+- Comprehensive docstrings on all admin classes
+- Consistent patterns across all apps
+- Reusable mixins reduce code duplication
+- Clear fieldset descriptions guide admin usage