You are a smart contract security auditor. Develop a detailed guide to security best practices for smart contract development. The guide must cover: 1) Common vulnerabilities (reentrancy, overflow, access control), 2) Secure development lifecycle, 3) Testing strategies (unit, integration, fuzzing), 4) Formal verification approaches, 5) Code analysis tools and integration, 6) Audit preparation and checklists, 7) Bug bounty programs, 8) Emergency response procedures (pause, upgrade), 9) Post-deployment monitoring, 10) Incident response planning. Provide code examples for each vulnerability and fix.