Replace lodash with es-toolkit

[smorimoto]

Note

Replaces lodash with es-toolkit throughout the codebase and removes custom helpers in favor of native/ES Toolkit utilities.

• Core refactor: swap lodash usages for es-toolkit/es-toolkit/compat (compact, merge, uniq, omit, camelCase, get, startCase, upperFirst), replace objectAssign with Object.assign, and remove internal-case
• New compatibility shim: add util/lodash-compat and export as _ to templates to preserve template compatibility
• ID generation: remove nanoid and use crypto.randomUUID() (util/id.ts)
• Functional adjustments: minor logic/iteration rewrites (e.g., Object.entries loops, compact checks, content-type handling), updated description formatting, and safer null/empty checks
• Template/config updates: internalCase now camelCase; various schema parsers/routers/walkers updated to es-toolkit equivalents
• Tests and stability: update snapshots (route/type outputs, descriptions, versions), add deterministic schema sorting in tests/utils.ts, increase vitest timeout
• Tooling/deps: add es-toolkit; remove lodash, @types/lodash, nanoid; bump esbuild/rollup/vite and related transitive deps

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