Add comprehensive MONERO.rst documentation

Document the amazing multi-tenant Monero cash register system:
- Multi-tenant architecture with account isolation
- Complete payment flow from checkout to cold storage
- Risk management with confirmation tiers
- Auto-sweep triggered by unlocked funds
- Database schema and payment tracking
- Benefits for all stakeholders

Fixed inaccuracies:
- Removed QR code references (not implemented yet)
- Corrected quote expiration to 60 minutes
- Fixed auto-sweep trigger (unlocked funds, not confirmations)
- Removed automatic quote renewal (quotes expire)
- Streamlined content focus

MONERO.rst

@@ -104,9 +104,9 @@ The complete payment lifecycle demonstrates the system's sophistication:
 
 **2. Customer Checkout**
    - Real-time XMR/USD rate fetched from CoinGecko
-   - Quote generated with 15-minute expiration
+   - Quote generated with 60-minute expiration
    - Unique subaddress created for this specific payment
-   - Customer sees QR code + payment details
+   - Customer sees payment address + amount details
 
 **3. Payment Monitoring**
    - Crypto watcher polls every 20 seconds
@@ -126,7 +126,7 @@ The complete payment lifecycle demonstrates the system's sophistication:
    - Purchase and sale emails sent automatically
 
 **5. Auto-Sweep to Cold Storage**
-   - Confirmed payments trigger automatic sweep
+   - Unlocked funds trigger automatic sweep (funds unlock ~10 blocks after confirmation)
    - All unlocked funds in shop's account swept together
    - Efficient: Not 1:1 payment-to-sweep mapping
    - Secure: Funds immediately moved to shop's cold wallet
@@ -162,72 +162,10 @@ Shop-configurable thresholds determine confirmation requirements:
 **Quote Expiration**
 --------------------
 - Time-limited quotes prevent rate manipulation
-- Configurable expiration (default: 15 minutes)
-- Automatic quote renewal for valid payments
+- Configurable expiration (default: 60 minutes)
+- Quotes expire and require new checkout if time limit exceeded
 - Expired payment refund system (when refund address available)
 
-Technology Stack
-================
-
-**Infrastructure**
-   - **monero-wallet-rpc**: Official Monero wallet daemon
-   - **Remote Nodes**: Public Monero nodes (no local blockchain required)
-   - **Salt Stack**: Automated deployment and configuration management
-   - **systemd**: Service management with automatic restart
-
-**Security Features**
-   - **Account Isolation**: Dedicated Monero accounts per shop
-   - **RPC Authentication**: Disabled for internal communication, secured by network isolation
-   - **Automatic Sweeping**: Immediate cold storage transfer
-   - **Network Hardening**: Localhost-only RPC binding
-
-**Monitoring & Reliability**
-   - **Health Checks**: Automatic service monitoring via Salt
-   - **Error Recovery**: Graceful handling of network issues and daemon disconnects
-   - **Logging**: Comprehensive payment and sweep transaction logging
-   - **Backup Systems**: Database backups and wallet file protection
-
-Configuration
-=============
-
-**Environment Variables**
-.. code-block:: bash
-
-   # Payment method toggles
-   export MPS_PAYMENTS_MONERO_ENABLED=True
-   export MPS_PAYMENTS_STRIPE_ENABLED=True
-
-   # Monero RPC configuration  
-   export MPS_MONERO_RPC_URL=http://127.0.0.1:18083/json_rpc
-   export MPS_MONERO_RPC_USER=     # Empty - no auth required
-   export MPS_MONERO_RPC_PASS=     # Empty - no auth required
-
-   # Confirmation requirements
-   export MPS_MONERO_CONFIRMATIONS_PETTY=2
-   export MPS_MONERO_CONFIRMATIONS_MID=10  
-   export MPS_MONERO_CONFIRMATIONS_HIGH=20
-
-**Salt State Management**
-.. code-block:: bash
-
-   # Deploy Monero infrastructure
-   salt 'mps-servers*' state.apply monero
-
-   # Deploy payment watcher
-   salt 'mps-servers*' state.apply monero.crypto-watcher
-
-**Service Management**
-.. code-block:: bash
-
-   # Check Monero wallet status
-   systemctl status monero-wallet-rpc.service
-   
-   # Check payment watcher
-   systemctl status mps-crypto-watcher.service
-   
-   # View payment processing logs
-   journalctl -fu mps-crypto-watcher.service
-
 Why This Is Amazing
 ===================