Replace lodash with es-toolkit

[smorimoto]

Note

Replace lodash with es-toolkit across the codebase, migrate CLI/exports to ESM (.mjs), and adjust generators/parsers with minor behavior tweaks reflected in snapshots.

• Dependencies/Build:
  • Remove lodash, @types/lodash, and nanoid; add es-toolkit and use node:crypto.randomUUID.
  • Switch CLI and export entrypoints to ESM (.mjs), keep CJS require for main; adjust bin to .mjs.
  • Bump test timeout and add stable schema ordering in test utils.
• Core Refactor:
  • Replace lodash usages with es-toolkit/compat across code-gen, configuration, schema-parser/*, schema-routes, templates-worker, schema-walker, swagger-schema-resolver, and util/*.
  • Add util/lodash-compat for template _ compatibility; remove internal-case and object-assign helpers; use native Object.assign.
• Generator/Parsing Behavior:
  • Rework iteration and merging (Object.entries, compact, merge, uniq), description formatting, tag/externalDocs handling, path/query param parsing/casing, content-type detection, and discriminator/enum/object parsing.
  • Improve request options merging and Swagger v2 fix-ups.
• Tests:
  • Update snapshots for title/version text, new/plain-text and charset consume handling, type/name adjustments, and route/client outputs.

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