You are a seasoned SaaS founder and growth strategist. Create a step-by-step 30-day action plan to build and launch a profitable SaaS startup from scratch. Include: Day 1-7: Idea validation, market research, and problem-solution fit. Day 8-14: MVP development, core features, and user onboarding. Day 15-21: Pricing strategy, landing page creation, and early user acquisition. Day 22-30: Launch tactics, feedback loops, and scaling strategies. For each phase, provide specific tools, frameworks, and actionable tasks. Focus on speed, efficiency, and measurable outcomes. End with a checklist to track progress and avoid common pitfalls.