feat: add integration examples for popular frameworks

MAINNET_LAUNCH_CHECKLIST.md

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+# 🚀 PrivacyLayer Mainnet Launch Checklist
+
+## Overview
+
+This checklist ensures PrivacyLayer is fully prepared for mainnet launch, covering security, testing, deployment, and communication requirements.
+
+---
+
+## Phase 1: Security Readiness
+
+### 1.1 Smart Contract Security
+
+- [ ] **Security Audit Completed**
+  - [ ] At least 2 independent audits from reputable firms
+  - [ ] All critical/high findings resolved
+  - [ ] Audit reports published publicly
+  - [ ] Re-audit completed for any significant changes
+
+- [ ] **Code Quality**
+  - [ ] 100% test coverage for critical paths
+  - [ ] All tests passing on latest commit
+  - [ ] No compiler warnings
+  - [ ] Gas optimization completed
+  - [ ] Reentrancy guards implemented where needed
+
+- [ ] **Access Control**
+  - [ ] Multi-sig wallet configured for admin functions
+  - [ ] Role-based permissions documented
+  - [ ] Emergency pause mechanism tested
+  - [ ] Timelock configured for sensitive operations
+
+### 1.2 Circuit Security (ZK Proofs)
+
+- [ ] **Circuit Audit**
+  - [ ] Independent circuit audit completed
+  - [ ] All constraint warnings resolved
+  - [ ] Edge cases tested (empty inputs, max values, etc.)
+  - [ ] Proof generation time within acceptable limits
+
+- [ ] **Trusted Setup**
+  - [ ] MPC ceremony completed (if applicable)
+  - [ ] Setup artifacts published and verifiable
+  - [ ] Phase 2 ceremony documented
+
+### 1.3 Infrastructure Security
+
+- [ ] **Node Security**
+  - [ ] DDoS protection configured
+  - [ ] Rate limiting implemented
+  - [ ] SSL/TLS certificates valid and auto-renewing
+  - [ ] Firewall rules reviewed and hardened
+
+- [ ] **Key Management**
+  - [ ] Private keys stored in HSM or secure vault
+  - [ ] Key rotation procedure documented
+  - [ ] Backup keys securely stored offline
+  - [ ] No hardcoded secrets in codebase
+
+---
+
+## Phase 2: Testing Requirements
+
+### 2.1 Functional Testing
+
+- [ ] **Unit Tests**
+  - [ ] All contracts have unit tests
+  - [ ] All circuits have unit tests
+  - [ ] Test coverage report: ≥95%
+  - [ ] Tests run in CI/CD pipeline
+
+- [ ] **Integration Tests**
+  - [ ] End-to-end flow tested (deposit → prove → withdraw)
+  - [ ] Cross-chain bridge tested (if applicable)
+  - [ ] Frontend ↔ Contract integration verified
+  - [ ] API endpoints tested
+
+- [ ] **Testnet Deployment**
+  - [ ] Deployed on testnet for ≥4 weeks
+  - [ ] No critical bugs discovered in final 2 weeks
+  - [ ] Real users tested core flows
+  - [ ] Bug bounty program active
+
+### 2.2 Performance Testing
+
+- [ ] **Load Testing**
+  - [ ] System handles expected TPS (transactions per second)
+  - [ ] Proof generation time < [X] seconds
+  - [ ] Proof verification time < [Y] seconds
+  - [ ] Database queries optimized
+
+- [ ] **Stress Testing**
+  - [ ] System behavior under 10x expected load documented
+  - [ ] Graceful degradation verified
+  - [ ] Recovery procedure tested
+
+### 2.3 User Acceptance Testing
+
+- [ ] **Beta Program**
+  - [ ] ≥100 beta users completed onboarding
+  - [ ] User feedback incorporated
+  - [ ] UX issues resolved
+  - [ ] Documentation validated by beta users
+
+---
+
+## Phase 3: Deployment Procedures
+
+### 3.1 Pre-Deployment
+
+- [ ] **Environment Setup**
+  - [ ] Production environment isolated from staging
+  - [ ] All environment variables documented
+  - [ ] Secrets loaded from secure vault
+  - [ ] Monitoring and alerting configured
+
+- [ ] **Contract Deployment**
+  - [ ] Deployment scripts tested on testnet
+  - [ ] Deployment runbook created
+  - [ ] Rollback procedure documented
+  - [ ] Contract verification on block explorer
+
+### 3.2 Deployment Day
+
+- [ ] **Go/No-Go Decision**
+  - [ ] All checklist items completed
+  - [ ] Core team available for launch
+  - [ ] Communication channels ready (Discord, Twitter, etc.)
+  - [ ] Final security scan completed
+
+- [ ] **Deployment Steps**
+  1. Deploy contracts to mainnet
+  2. Verify contracts on block explorer
+  3. Initialize contracts with correct parameters
+  4. Transfer ownership to multi-sig
+  5. Deploy frontend to production
+  6. Update DNS records
+  7. Enable monitoring alerts
+  8. Announce launch
+
+### 3.3 Post-Deployment
+
+- [ ] **Verification**
+  - [ ] All contracts respond correctly
+  - [ ] Frontend connects to mainnet
+  - [ ] First transaction successful
+  - [ ] Monitoring dashboards show healthy status
+
+- [ ] **Documentation**
+  - [ ] Deployment report created
+  - [ ] Contract addresses published
+  - [ ] Known issues documented
+  - [ ] Support channels staffed
+
+---
+
+## Phase 4: Rollback Plans
+
+### 4.1 Emergency Scenarios
+
+- [ ] **Critical Bug Discovered**
+  - [ ] Emergency pause mechanism tested
+  - [ ] Team can pause contracts within 15 minutes
+  - [ ] Communication template prepared
+  - [ ] Hotfix deployment procedure documented
+
+- [ ] **Exploit Detected**
+  - [ ] Emergency response team identified
+  - [ ] Contact list for exchanges/bridges ready
+  - [ ] Forensic analysis procedure documented
+  - [ ] User communication plan prepared
+
+### 4.2 Rollback Procedures
+
+- [ ] **Contract Rollback**
+  - [ ] Upgrade mechanism tested (if proxy pattern used)
+  - [ ] Migration procedure for user funds documented
+  - [ ] Rollback decision criteria defined
+
+- [ ] **Frontend Rollback**
+  - [ ] Previous version tagged and deployable
+  - [ ] DNS rollback procedure tested
+  - [ ] CDN cache purge procedure documented
+
+---
+
+## Phase 5: Communication Strategy
+
+### 5.1 Pre-Launch
+
+- [ ] **Announcement Plan**
+  - [ ] Blog post drafted
+  - [ ] Social media posts scheduled
+  - [ ] Press release prepared (if applicable)
+  - [ ] Community AMAs scheduled
+
+- [ ] **Documentation**
+  - [ ] User guide published
+  - [ ] Developer documentation complete
+  - [ ] FAQ page created
+  - [ ] Video tutorials recorded
+
+### 5.2 Launch Day
+
+- [ ] **Communication Channels**
+  - [ ] Twitter/X announcement posted
+  - [ ] Discord announcement made
+  - [ ] Email newsletter sent
+  - [ ] Blog post published
+
+- [ ] **Support Readiness**
+  - [ ] Support team briefed
+  - [ ] Common issues FAQ prepared
+  - [ ] Escalation procedure defined
+  - [ ] Response time SLA: <1 hour
+
+### 5.3 Post-Launch
+
+- [ ] **Follow-Up**
+  - [ ] Launch metrics published (24h, 7d, 30d)
+  - [ ] User feedback collected
+  - [ ] Post-mortem scheduled (regardless of success)
+  - [ ] Thank you message to community
+
+---
+
+## Phase 6: Compliance & Legal
+
+### 6.1 Regulatory Compliance
+
+- [ ] **Legal Review**
+  - [ ] Token classification reviewed by legal counsel
+  - [ ] Terms of Service published
+  - [ ] Privacy Policy published
+  - [ ] KYC/AML requirements assessed (if applicable)
+
+- [ ] **Geographic Restrictions**
+  - [ ] Restricted countries identified
+  - [ ] Geo-blocking implemented (if required)
+  - [ ] Compliance documentation prepared
+
+---
+
+## Sign-Off
+
+| Role | Name | Date | Status |
+|------|------|------|--------|
+| **Technical Lead** | | | ☐ Approved |
+| **Security Lead** | | | ☐ Approved |
+| **Product Lead** | | | ☐ Approved |
+| **Legal Counsel** | | | ☐ Approved |
+| **CEO/Founder** | | | ☐ Approved |
+
+---
+
+## Appendix
+
+### A. Emergency Contacts
+
+| Role | Name | Contact |
+|------|------|---------|
+| On-Call Engineer | | |
+| Security Lead | | |
+| Legal Counsel | | |
+| CEO/Founder | | |
+
+### B. External Resources
+
+- **Audit Firms:** [List of audited firms and report links]
+- **Block Explorers:** [Etherscan, etc.]
+- **Monitoring:** [Dashboard links]
+- **Status Page:** [status.privacylayer.io]
+
+### C. Revision History
+
+| Version | Date | Author | Changes |
+|---------|------|--------|---------|
+| 1.0 | | | Initial draft |
+
+---
+
+**Last Updated:** [Date]
+**Next Review:** [Date + 30 days]
+
+**Contact:** security@privacylayer.io for questions or concerns.