Remove Swift implementation, finalize pure Objective-C architecture

Changes:
- Removed BranchSwiftSDK target from Package.swift
- Deleted all Swift source files (BranchRequestQueue, BranchRequestOperation, ConfigurationController)
- NO bridge code, NO Swift dependencies
- Pure NSOperationQueue-based Objective-C solution

Architecture:
- Single Objective-C target (BranchSDK)
- NSOperationQueue for request processing
- BNCServerRequestOperation wrapper
- Thread-safe by design
- iOS 12.0+ compatibility

Build Status: ✅ Successful (Xcode + SPM)

Author: wpinho-branch

Package.swift

@@ -12,12 +12,12 @@ let package = Package(
         // Main product that clients will import
         .library(
             name: "BranchSDK",
-            targets: ["BranchSDK", "BranchSwiftSDK"]),
+            targets: ["BranchSDK"]),
     ],
     dependencies: [
     ],
     targets: [
-        // Main Objective-C SDK target
+        // Main Objective-C SDK target with modern NSOperationQueue implementation
         .target(
             name: "BranchSDK",
             dependencies: [],
@@ -34,15 +34,6 @@ let package = Package(
                 .linkedFramework("CoreSpotlight", .when(platforms: [.iOS])),
                 .linkedFramework("AdServices", .when(platforms: [.iOS]))
             ]
-        ),
-        // Swift Concurrency layer (depends on main SDK)
-        .target(
-            name: "BranchSwiftSDK",
-            dependencies: ["BranchSDK"],
-            path: "Sources/BranchSwiftSDK",
-            swiftSettings: [
-                .define("SWIFT_PACKAGE")
-            ]
         )
     ]
 )