feat(web3): Decentralized Autonomous Organization (DAO) Mandi Governance & Dispute Voting

[hrshjswniii]

📌 Overview

This PR implements [feature] : Decentralized Autonomous Organization (DAO) Mandi Governance & Dispute Voting establishing transparent, on-chain Web3 governance for regional farmer cooperatives, Mandi inspectors, and transport lead delegates to vote on cold-chain dispute escrow resolution and protocol parameters.

Key Changes Introduced:

1. Smart Contracts Architecture:
   • Created [MandiGovernanceToken.sol] implementing an upgradeable ERC-20 Votes token (MNDI).
   • Created [MandiDAO.sol] implementing an OpenZeppelin Governor contract with 4% quorum fraction, voting delay/period controls, and dispute execution hooks.
2. Backend Service Layer:
   • Created [backend/services/daoService.js] formatting dispute proposal states and encoding vote transaction payloads.
3. Frontend Governance Portal:
   • Created [frontend/src/app/mandi/governance/page.tsx]rendering Mandi DAO Governance Portal UI with active dispute proposal cards, quorum progress bars, and voting controls.
4. Automated Unit Test Suite:
   • Created [smart-contracts/test/mandiDAO.test.js] testing token minting, voting power delegation, proposal creation, and voting (2/2 tests passing).

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🛠️ Type of Change

• ⛓️ Smart Contract (Solidity changes, Governor DAO, OpenZeppelin)
• 💻 Frontend (UI/UX, Next.js page, Web3 voting portal)
• ⚙️ Backend (Service helper, proposal encoding)
• 📄 Documentation (README, Roadmap updates)
• 🧪 Testing (Hardhat unit tests)

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🔗 Related Issue

Closes #1315

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🧪 Testing & Verification

• Smart Contracts: npx hardhat test test/mandiDAO.test.js passed? (Yes) — 2/2 tests passing in 16s.
• Backend: daoService.js proposal formatting verified? (Yes).
• Frontend: mandi/governance/page.tsx portal rendering verified? (Yes).

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✅ PR Checklist

• My code follows the project's style guidelines.
• I have commented my code, particularly in complex areas (e.g., GovernorUpgradeable initialization & proposal hashing).
• I have updated the documentation accordingly.
• My changes generate no new warnings.

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💬 Additional Notes

• Created [smart-contracts/contracts/MandiGovernanceToken.sol]
• Created [smart-contracts/contracts/MandiDAO.sol]
• Created [smart-contracts/test/mandiDAO.test.js]
• Created [backend/services/daoService.js]
• Created [frontend/src/app/mandi/governance/page.tsx]

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