DevTooling: Implement Monorepo with Turborepo for Shared Packages

[Smartdevs17]

Description\nMigrate codebase to monorepo with shared packages for types, utilities, and contracts. Current duplicate code causes inconsistencies.\n\nCurrent Limitation: Multiple codebases with duplication.\nExpected Outcome: Turborepo monorepo with shared @agenticpay/types, utils, and contracts packages.\n## Acceptance Criteria\n- [ ] Turborepo configuration\n- [ ] @agenticpay/types package\n- [ ] @agenticpay/utils package\n- [ ] @agenticpay/contracts package\n- [ ] Shared ESLint config\n- [ ] Shared TypeScript config\n- [ ] Task pipelines (build, test, lint)\n- [ ] Cache configuration\n## Technical Scope\n- Files: packages/*, turbo.json\n- Edge Cases: Version alignment, breaking changes\n## Complexity Estimate\n200 points - Monorepo setup, package structure.

[onelove-dev]

@onelove-dev has applied to work on this issue as part of the Stellar Wave Program's 4th wave.

Hi, I would like to work on this. I can implement the required logic while ensuring the solution is clean, fully tested, and follows your project standards. I am ready to start immediately and will deliver a high-quality PR within the timeframe.

ETA: 4 hours. Please assign this to me.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @onelove-dev to this issue.

[drips-wave]

Congratulations, @onelove-dev! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on April 29, 2026.

🧑‍💻 @onelove-dev: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

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[drips-wave]

This issue has been completed by @onelove-dev as part of the Stellar Wave Program's 4th Wave 🥳

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