Fix SwiftLint line_length in Constants.swift

Extract ProcessInfo.environment into a private static to shorten the
domain/scheme/port lines under the 120-char limit.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: dadachi

NativeAppTemplate/Constants.swift

@@ -94,9 +94,10 @@ enum NativeAppTemplateConstants {
 
 extension String {
     #if DEBUG
-    static let scheme: String = ProcessInfo.processInfo.environment["NATEMPLATE_API_SCHEME"] ?? "https"
-    static let domain: String = ProcessInfo.processInfo.environment["NATEMPLATE_API_DOMAIN"] ?? "api.nativeapptemplate.com"
-    static let port: String = ProcessInfo.processInfo.environment["NATEMPLATE_API_PORT"] ?? ""
+    private static let env = ProcessInfo.processInfo.environment
+    static let scheme: String = env["NATEMPLATE_API_SCHEME"] ?? "https"
+    static let domain: String = env["NATEMPLATE_API_DOMAIN"] ?? "api.nativeapptemplate.com"
+    static let port: String = env["NATEMPLATE_API_PORT"] ?? ""
     #else
     static let scheme: String = "https"
     static let domain: String = "api.nativeapptemplate.com"