fix: resolve all backend issues

[navin-oss]

Fixes Applied:

1. server.js - Duplicate mongoose declaration - Removed duplicate on line 24

2. server.js - generateBatchId function - Fixed missing closing braces and removed duplicate definition

3. server.js - contractABI - Aligned with CropChain.sol:

   • BatchUpdated: string stage → uint8 stage (enum)
   • createBatch: 3 params → 7 params (batchId, cropTypeHash, ipfsCID, quantity, actorName, location, notes)
   • Added updateBatch function

4. reconcile.js - Fixed broken blockchain iteration:

   • Uses getTotalBatches() instead of non-existent getBatchCount()
   • Uses getBatchIdIndex(i) instead of non-existent batches(i)

5. server.js - Authentication - Removed duplicate auth middleware, uses middleware from auth.js exclusively

6. New file: config/blockchain.js - Provides getContract() function

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[vedhapprakashni]

@navin-oss resolve conflicts

[Nitya-003]

@navin-oss Please the mention you are resolving. I am assigning you all the issues raised by you but please mention the issue number you are solving so it gets easier for us.

[vedhapprakashni]

@navin-oss which issue does this close?

[vedhapprakashni]

@navin-oss pls resolve conflicts in 3 pr's you opened

[vedhapprakashni]

@navin-oss pls check this asap