Feat/search notifications payments

[coderDom-x]

feat: enhance search, notifications batching and payment method management

Summary

This PR improves core platform functionality across search, notifications, and payments, focusing on performance, usability, and scalability.

Search Improvements (#543, #544)

• Optimized Elasticsearch query performance
• Improved index mapping and structure
• Added advanced filters (category, price range, rating, instructor)
• Implemented search facets and aggregations
• Improved search responsiveness under load

Notifications System (#542)

• Implemented notification deduplication to prevent duplicate alerts
• Added batching system to group notifications by type
• Configured timed batch delivery (e.g., every 5 minutes)
• Added support for urgent notifications bypassing batching
• Added unit tests for deduplication and batching logic

Payment Method Management (#555)

• Added APIs for creating, updating, and deleting payment methods
• Implemented endpoint to set default payment method
• Added validation and secure handling of payment data

Testing & Validation

• Unit tests added for search, notifications, and payments
• Verified filtering and aggregation logic
• Ensured no duplicate notifications are delivered
• Confirmed payment endpoints work with validation rules

Closing Issues

Closes #542
Closes #543
Closes #544
Closes #555

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