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Tighten dynamic define_method definitions in callbacks and routing DSL

- callbacks: replace runtime `pluralize.to_sym` with a precomputed
  `method_name -> plural_key` mapping so the namespace_stackable key
  is resolved at load time instead of on every callback definition.
- routing: replace `*args` + `args.first || ['/']` with a proper
  default-arg signature (`path = '/'`), removing the splat allocation
  and array-of-arrays default.

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

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