Refactor/extract services from server

[navin-oss]

Successfully refactored the backend/server.js "God file" into dedicated services following the Separation of Concerns principle. The new branch refactor/extract-services-from-server has been pushed to the remote.

Created Services:

1. BlockchainService

• Handles blockchain initialization, validation, and transactions
• Methods: createBatchOnChain(), updateBatchOnChain(), getBatchFromChain(), simulateHash()
• Integrates with existing blockchain.js config

2. BatchService

• Handles all batch business logic (CRUD operations)
• Methods: generateBatchId(), generateQRCode(), createBatch(), getBatch(), updateBatch(), recallBatch(), getAllBatches(), calculateStats(), getDashboardStats()
• Handles MongoDB transactions and integrates with blockchain and notification services

3. NotificationService

• Handles all notifications and alerts
• Methods: alertRecall(), sendRecallNotification(), notifyBatchCreated(), notifyBatchUpdated(), notifySecurityEvent(), notifyError()
• Includes placeholders for email and push notifications

4. Refactored server.js

• Simplified route handlers by delegating to services
• Reduced code from ~680 lines to ~380 lines
• Clean separation of middleware, routes, and business logic

Benefits:

• Improved testability - Services can be unit tested independently
• Easier debugging - Clear separation of concerns
• Scalable architecture - Services can be modified independently
• Follows Single Responsibility Principle

Branch Details:

• Branch: refactor/extract-services-from-server
• Commit: 4 files changed, 871 insertions(+), 264 deletions(-)
• Remote URL: https://github.com/navin-oss/CropChain/pull/new/refactor/extract-services-from-server