docs: add product strategy, monetization plan, and investor pitch
Adds comprehensive business documentation:
- Product Strategy (product-strategy.md):
- Vision and mission
- Value proposition and target personas
- Market analysis (TAM/SAM/SOM)
- Competitive positioning
- Monetization model (freemium + subscription)
- Pricing tiers (Free, Starter, Pro, Team, Enterprise)
- Go-to-market strategy
- Success metrics and KPIs
- Product roadmap
- Investor Pitch (investor-pitch.md):
- 12-slide pitch deck
- Financial projections
- Unit economics
- Team structure
- Use of funds
- Competitive analysis appendix
- Pricing Page (pricing/page.tsx):
- Visual pricing comparison
- Feature matrix
- FAQ section
- CTA components
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