Remove env= setting from generated config (not available in V2 Settings API)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: crimson-knight

src/amber_cli/commands/new.cr

@@ -232,7 +232,6 @@ module AmberCLI::Commands
         Amber::Server.configure do |settings|
           settings.name = "#{name}"
           settings.port = ENV["PORT"]?.try(&.to_i) || 3000
-          settings.env = ENV["AMBER_ENV"]? || "development"
         end
         CONFIG