Fix Rails 8.2 deprecation warnings and improve Rack compatibility

This commit addresses two issues:

1. Rails 8.2 Deprecation Warning: Update routing_ext.rb to use keyword
   arguments instead of hash arguments when calling `resource` and
   `resources` methods. The hash argument support will be removed in
   Rails 8.2.

2. Rack Compatibility: Update status_code_for method to prefer
   Rack::Utils.status_code (Rack 3.0+) while maintaining backward
   compatibility with Rack 2.x using SYMBOL_TO_STATUS_CODE.

Addresses feedback from speee#1

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: takaokouji

lib/jsonapi/error.rb

@@ -13,7 +13,28 @@ class Error
     def self.status_code_for(status_symbol)
       return nil if status_symbol.nil?
 
-      # Try the symbol directly first
+      # Use Rack::Utils.status_code if available (Rack 3.0+)
+      if Rack::Utils.respond_to?(:status_code)
+        begin
+          # status_code returns integer, convert to string
+          code = Rack::Utils.status_code(status_symbol)
+          return code&.to_s
+        rescue ArgumentError
+          # If the symbol is not recognized, try deprecated symbols
+          if DEPRECATED_STATUS_SYMBOLS.key?(status_symbol)
+            begin
+              code = Rack::Utils.status_code(DEPRECATED_STATUS_SYMBOLS[status_symbol])
+              return code&.to_s
+            rescue ArgumentError
+              # Symbol not found even after trying deprecated mapping
+              return nil
+            end
+          end
+          return nil
+        end
+      end
+
+      # Fallback to SYMBOL_TO_STATUS_CODE for Rack 2.x
       code = Rack::Utils::SYMBOL_TO_STATUS_CODE[status_symbol]
 
       # If not found and it's a deprecated symbol, try the new symbol

lib/jsonapi/routing_ext.rb

@@ -46,7 +46,7 @@ def jsonapi_resource(*resources, &_block)
             options[:except] << :destroy unless options[:except].include?(:destroy) || options[:except].include?('destroy')
           end
 
-          resource @resource_type, options do
+          resource @resource_type, **options do
             # :nocov:
             if @scope.respond_to?(:[]=)
               # Rails 4
@@ -133,7 +133,7 @@ def jsonapi_resources(*resources, &_block)
             options[:except] << :destroy unless options[:except].include?(:destroy) || options[:except].include?('destroy')
           end
 
-          resources @resource_type, options do
+          resources @resource_type, **options do
             # :nocov:
             if @scope.respond_to?(:[]=)
               # Rails 4