Implement Model Preloading and Caching System

[shubhh139]

Currently, models are loaded on first request which causes significant delays (30-60 seconds). Implement a comprehensive model preloading and caching system to ensure fast response times for all AI4Bharat services.

Acceptance Criteria

• Implement model preloading at application startup
• Add model caching mechanism to prevent reloading
• Add model warmup endpoints for manual preloading
• Implement model health checks and auto-reloading
• Add model memory management and cleanup
• Add configuration for model preloading behavior
• Add model loading progress indicators
• Add model versioning and updates