docs: add mainnet launch readiness checklist

[Dataguru-tech]

PR 1
Creates docs/MAINNET_CHECKLIST.md with sections covering Smart Contracts,
Backend, Frontend, and Infrastructure readiness criteria for mainnet launch.

PR 2
Summary
Creates docs/MAINNET_CHECKLIST.md to establish a formal readiness
process before Trivela launches on mainnet.

What's included

• Smart Contracts section covering upgrade, TTL, storage, admin transfer,
  fuzzing, audit, and deployment checks
• Backend section covering indexer, database, caching, secrets, and monitoring
• Frontend section covering env config, wallet errors, and performance targets
• Infrastructure section covering deploy pipeline, backups, incident response,
  and security documentation

PR 3
Added docs/MAINNET_CHECKLIST.md with checkboxes across four sections:

• Smart Contracts — upgrade entrypoint, TTL values, persistent storage, admin transfer, fuzz targets, security audit, and deployment verification
  -Backend — event indexer, database configuration, migrations, Redis caching, rate limits, secret rotation, and monitoring
• Frontend — mainnet env variables, wallet error handling, no testnet references, and performance targets
• Infrastructure — deploy pipeline, backup strategy, incident response runbook, and SECURITY.md

PR 4
Updated CONTRIBUTING.md to include:

• Environment setup — detailed step-by-step instructions from zero to running the project locally
• Good first issue walkthrough — a guided quick win so new contributors can get a merged PR fast
• PR review process — clear explanation of what happens after you open a PR and expected turnaround times
• Visual guide — diagrams and/or screenshots to support contributors who learn visually
  Closes Backend: Add wallet-signature-based auth for campaign creation/management #302
  closes DevOps: Add multi-environment configuration matrix and environment promotion guide #307
  closes Docs: Create mainnet launch readiness checklist #309
  closes Docs: Add contributor fast-start guide (zero to merged PR in 10 minutes) #311

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