style(coredata, wallet, service): remove redundant ABOUTME comments and fix SwiftLint issues

Removed duplicate ABOUTME comments from Core Data entity files, wallet models, and service files to clean up code headers. Fixed SwiftLint issues including missing trailing newlines and header comment patterns across multiple files. Added a new markdown file documenting the SwiftLint fixes applied.

Co-authored-by: terragon-labs[bot] <terragon-labs[bot]@users.noreply.github.com>

Author: rabble

Nos/Models/CoreData/CashuTokenCache+CoreDataClass.swift

@@ -1,6 +1,3 @@
-// ABOUTME: Core Data entity for caching individual Cashu tokens
-// ABOUTME: Tracks token state and provides efficient querying
-
 import Foundation
 import CoreData
 import CashuSwift

Nos/Models/CoreData/CashuTokenCache+CoreDataProperties.swift

@@ -1,6 +1,3 @@
-// ABOUTME: Core Data generated properties for CashuTokenCache entity
-// ABOUTME: Defines attributes and relationships for token caching
-
 import Foundation
 import CoreData
 

Nos/Models/CoreData/CashuTransaction+CoreDataClass.swift

@@ -1,6 +1,3 @@
-// ABOUTME: Core Data entity for tracking Cashu wallet transactions
-// ABOUTME: Provides transaction history and analytics capabilities
-
 import Foundation
 import CoreData
 

Nos/Models/CoreData/CashuTransaction+CoreDataProperties.swift

@@ -1,6 +1,3 @@
-// ABOUTME: Core Data generated properties for CashuTransaction entity
-// ABOUTME: Defines attributes and relationships for transaction tracking
-
 import Foundation
 import CoreData
 

Nos/Models/CoreData/CashuWalletCache+CoreDataClass.swift

@@ -1,6 +1,3 @@
-// ABOUTME: Core Data entity for caching Cashu wallet data locally
-// ABOUTME: Provides fast access to wallet information and balance calculations
-
 import Foundation
 import CoreData
 

Nos/Models/CoreData/CashuWalletCache+CoreDataProperties.swift

@@ -1,6 +1,3 @@
-// ABOUTME: Core Data generated properties for CashuWalletCache entity
-// ABOUTME: Defines all attributes and relationships for wallet caching
-
 import Foundation
 import CoreData
 

Nos/Models/Wallet/CashuSwiftIntegration.swift

@@ -1,6 +1,3 @@
-// ABOUTME: Bridge between CashuSwift library types and Nos wallet implementation
-// ABOUTME: Provides type conversions and real Cashu protocol operations
-
 import Foundation
 import CashuSwift
 

Nos/Models/Wallet/CashuWallet.swift

@@ -1,5 +1,4 @@
-// ABOUTME: Core CashuWallet model for managing Cashu ecash wallets
-// ABOUTME: Implements NIP-60 wallet data storage and NIP-61 nutzap support
+// ABOUTME: Core CashuWallet model for managing Cashu ecash wallets and implements NIP-60/NIP-61 support
 
 import Foundation
 import CashuSwift

Nos/Models/Wallet/CashuWalletTokenStorage.swift

@@ -1,6 +1,3 @@
-// ABOUTME: Token storage and retrieval methods for CashuWallet
-// ABOUTME: Manages fetching and storing tokens using Core Data cache
-
 import Foundation
 import CoreData
 import CashuSwift

Nos/Service/CashuCacheService.swift

@@ -1,6 +1,3 @@
-// ABOUTME: Service for managing Core Data cache of Cashu wallet data
-// ABOUTME: Handles synchronization between Nostr events and local cache
-
 import Foundation
 import CoreData
 import CashuSwift