docs(readme): list CRM module under Beta Features with own-risk disclaimer

PR #555 shipped the CRM module on beta. The README's "Beta Features
(Use at your own risk)" table is the right place to signal that the
feature exists, is opt-in, and carries non-trivial legal / financial
caveats — readers landing on the README should not first discover the
CRM by enabling its feature flags and bumping into the seeded
example contract bodies without warning.

Adds one row to the Beta Features table linking to
docs.picpeak.app/features/crm where the full disclaimers,
sub-feature pages, and admin-settings reference live.

CRM is intentionally NOT added to the top-of-README "Key Features"
list — those are stable, production-ready features. Mixing the beta
CRM in there would undermine the clear stable/beta distinction.

README.md

@@ -401,6 +401,7 @@ These features are currently in beta testing and may have limited functionality
 
 | Feature | Description | Status |
 |---------|-------------|--------|
+| **CRM Module** | Quotes, contracts, invoices, hours logging, calendar, and tax report — feature-flagged off by default. Seeded contract blocks, payment terms, and IBAN / tax defaults are **examples only** and need legal / financial review before customer-facing use. See [docs.picpeak.app/features/crm](https://docs.picpeak.app/features/crm). | 🧪 Beta |
 | **Simple Deployment Script** | One-click deployment script for quick server setup with automated configuration and dependency installation | 🧪 Beta |
 
 ### 📋 Future Enhancements