Create evlog Framework Integration

Add a new framework integration to evlog. The recommended path is the manifest mode built on defineFrameworkIntegration from evlog/toolkit — for any framework with a request/response middleware shape (Hono, Express, Elysia, Fastify, …). For frameworks with a fundamentally different lifecycle (NestJS interceptors, SvelteKit handle hooks, Next.js App Router) you'll fall back to the lower-level createMiddlewareLogger.

Two paths

• Manifest mode (preferred, ~30 lines of glue) — call defineFrameworkIntegration({ name, extractRequest, attachLogger, storage? }) once at module level, then write a tiny middleware that calls integration.start(ctx, options) and runs the framework's next() inside runWith. Reference implementations: packages/evlog/src/{hono,express,elysia,fastify}/index.ts.
• Custom mode — use createMiddlewareLogger directly when the framework's lifecycle doesn't fit a standard middleware (NestJS, Next.js, SvelteKit). All current built-ins for those frameworks live under packages/evlog/src/{nestjs,next,sveltekit}/.

Manifest mode covers ~80% of integrations and reduces glue from 50–80 lines to ~30. Use custom mode only when you can't extract a request synchronously at the start of the lifecycle.

PR Title

Recommended format for the pull request title:

feat({framework}): add {Framework} middleware integration