feat: Add comprehensive Redis caching layer

[akargi]

• Closes Add Redis Caching Layer #430

Implements production-ready Redis caching system with the following features:

Cache Strategy

• Multi-tier caching approach
• Configurable TTLs for different data types
• Cache-aside (lazy-load) pattern
• Cache warming on startup
• Automatic cache invalidation

Cache Configuration

• Redis connection with automatic retry
• Support for password authentication
• Configurable database selection
• Connection string generation
• Environment variable support

Cache Keys & Tagging

• Organized cache key structure
• Tag-based grouped invalidation
• Cache keys for:
  • Users (profile, search, list)
  • Properties (listing, search, featured)
  • Dashboard (stats, analytics)
  • Trust scores (individual, leaderboard)
  • Sessions (user-specific)
  • Authentication (tokens, API keys)
  • Email verification
  • Rate limiting

Cache Service Features

• Get/Set/Delete operations
• Batch delete operations
• Cache-aside pattern (getOrSet)
• Tag-based invalidation
• User cache invalidation
• Property cache invalidation
• Dashboard cache invalidation
• Trust score cache invalidation
• Cache statistics retrieval
• Redis connection health check

Cache Invalidation Strategies

• Invalidate by key
• Invalidate by multiple keys
• Invalidate by tag (grouped)
• User-specific invalidation
• Property-specific invalidation
• Dashboard-specific invalidation
• Trust score-specific invalidation

Cache Warming

• Startup cache warming
• Featured properties pre-loading
• Leaderboard pre-loading
• Dashboard data pre-loading
• Configurable warming interval
• Automatic retry on failure

Performance Monitoring

• Cache hit/miss tracking
• Average response time calculation
• Hit rate percentage
• Performance alerts
• Metrics logging and retrieval
• Response time measurement

Components Created

• cache.config.ts: Configuration and constants
• cache.service.ts: Core caching operations
• cache-monitoring.service.ts: Performance metrics
• cache-metrics.interceptor.ts: Auto metrics tracking
• cache-warming.service.ts: Cache pre-loading
• cache.decorator.ts: Injection decorator
• cache.module.ts: Global module setup

Features

• Automatic cache metrics tracking
• Performance monitoring and alerts
• Cache health status checks
• Flexible TTL configuration
• Error resilience and fallback
• Logging for debugging
• Tag-based cache management

Integration

• Global cache module in app.module.ts
• Cache metrics interceptor in main.ts
• Automatic service initialization
• Health monitoring on startup

Build Status

• Zero compilation errors
• All dependencies installed
• Production-ready implementation

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