feat: subscription tiers, period filter, dashboards, docs

- Add subscription tiers (Basic/Pro/Business) with listing limits and dynamic commission
- Add daily/monthly period filter on rentals page
- Add landlord dashboard with earnings chart, stat cards, property performance
- Add landlord subscription management page
- Add tenant dashboard with upcoming stays
- Add business model documentation

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

docs/growth-projections.md

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+# Growth Projection Template
+
+## Key Formulas
+
+### Monthly Recurring Revenue (MRR)
+
+```
+MRR = (N_pro × $9.99) + (N_business × $29.99) + Monthly Commission Revenue
+
+Monthly Commission Revenue = Sum of all booking commissions in month
+```
+
+### Annual Recurring Revenue (ARR)
+
+```
+ARR = MRR × 12
+```
+
+### Customer Lifetime Value (LTV)
+
+```
+LTV = ARPL × Average Customer Lifetime (months)
+
+ARPL = (Subscription Revenue + Commission Revenue) / Total Active Landlords
+
+Average Customer Lifetime = 1 / Monthly Churn Rate
+```
+
+### Customer Acquisition Cost (CAC)
+
+```
+CAC = Total Marketing Spend / New Landlords Acquired
+
+LTV:CAC Ratio target: > 3:1
+```
+
+### Average Booking Value (ABV)
+
+```
+ABV = Total Booking GMV / Number of Bookings
+```
+
+## Projection Model
+
+### Assumptions
+
+| Metric | Month 1 | Month 6 | Month 12 |
+|--------|---------|---------|----------|
+| Total Landlords | 50 | 300 | 1,000 |
+| BASIC (%) | 80% | 60% | 50% |
+| PRO (%) | 15% | 25% | 30% |
+| BUSINESS (%) | 5% | 15% | 20% |
+| Avg Bookings/Landlord/mo | 2 | 3 | 4 |
+| Avg Booking Value | $300 | $350 | $400 |
+| Monthly Churn | 10% | 7% | 5% |
+
+### Revenue Projections
+
+| Revenue Stream | Month 1 | Month 6 | Month 12 |
+|---------------|---------|---------|----------|
+| **Subscriptions** | | | |
+| PRO (N × $9.99) | $74.93 | $749.25 | $2,997.00 |
+| BUSINESS (N × $29.99) | $74.98 | $1,349.55 | $5,998.00 |
+| **Rental Commissions** | | | |
+| BASIC (10%) | $2,400 | $18,900 | $80,000 |
+| PRO (7%) | $315 | $3,675 | $33,600 |
+| BUSINESS (5%) | $75 | $1,575 | $16,000 |
+| **Total Monthly Revenue** | **$2,939.91** | **$26,248.80** | **$138,595.00** |
+
+### Growth Metrics
+
+```
+Month-over-Month Growth = (MRR_current - MRR_previous) / MRR_previous × 100
+
+Net Revenue Retention = (MRR from existing customers at end) / (MRR from same customers at start) × 100
+
+Gross Margin = (Revenue - COGS) / Revenue × 100
+  COGS = Stripe fees + Hosting + Support
+  Target Gross Margin: > 70%
+```
+
+## Scenario Planning
+
+### Conservative
+- 30% MoM landlord growth
+- 60% stay on BASIC
+- ABV: $250
+
+### Base
+- 50% MoM landlord growth
+- 50% upgrade to PRO/BUSINESS within 6 months
+- ABV: $350
+
+### Aggressive
+- 80% MoM landlord growth
+- 60% upgrade to PRO/BUSINESS within 3 months
+- ABV: $500