fix: ensure CTX API endpoints switch correctly between testnet and mainnet

- Removed cached kBaseURL constant that was preventing network switching
- baseURL property now computes URL dynamically based on current network
- This fixes the issue where switching from testnet to mainnet (or vice versa) required app restart
- Updated CLAUDE.md with network switching documentation and best practices

The issue occurred because the API endpoint was cached at initialization time.
Now it correctly evaluates the network on each request, ensuring:
- Testnet uses: http://staging.spend.ctx.com/
- Mainnet uses: https://spend.ctx.com/

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

Author: bfoss765

CLAUDE.md

@@ -385,6 +385,27 @@ The project expects sibling directories:
 
 ## Special Considerations
 
+### Network Switching (Testnet/Mainnet)
+**Important**: External API endpoints must switch dynamically when changing between testnet and mainnet without requiring app restart.
+
+#### CTX API Configuration
+- **Mainnet**: `https://spend.ctx.com/`
+- **Testnet**: `http://staging.spend.ctx.com/`
+- The endpoint URL is computed dynamically in `CTXSpendEndpoint.baseURL` property
+- **Never cache the base URL** as a constant - it must be evaluated on each request to ensure the correct network endpoint is used
+
+**Implementation Pattern**:
+```swift
+// ❌ WRONG - Caches URL at initialization
+private let kBaseURL = URL(string: CTXConstants.baseURI)!
+public var baseURL: URL { return kBaseURL }
+
+// ✅ CORRECT - Computes URL dynamically
+public var baseURL: URL {
+    return URL(string: CTXConstants.baseURI)!
+}
+```
+
 ### DashPay Features
 - Conditional compilation with `#if DASHPAY`
 - Username registration and management

DashWallet/Sources/Models/Explore Dash/Services/DashSpend/CTX/CTXSpendEndpoint.swift

@@ -18,8 +18,6 @@
 import Foundation
 import Moya
 
-private let kBaseURL = URL(string: CTXConstants.baseURI)!
-
 // MARK: - CTXSpendAPIError
 
 struct CTXSpendAPIError: Decodable {
@@ -64,7 +62,9 @@ extension CTXSpendEndpoint: TargetType, AccessTokenAuthorizable {
     }
 
     public var baseURL: URL {
-        return kBaseURL
+        // Dynamically compute the base URL based on the current network
+        // This ensures the correct endpoint is used even when switching between testnet/mainnet
+        return URL(string: CTXConstants.baseURI)!
     }
 
     public var path: String {