feat: multi-framework adapters (Fastify, Hono, Next.js App Router, Express)

[codebygarv]

Phase 1: Multi-Framework Adapters

This Pull Request expands @codebygarv/express-lens with dedicated adapters and package subpath exports for Fastify, Hono & Edge, Next.js App Router, and Express.

Resolves #4

Changes Included

• Fastify Adapter (@codebygarv/express-lens/fastify): Fastify plugin with onRequest and onResponse hooks.
• Hono & Edge Adapter (@codebygarv/express-lens/hono): WinterCG Web API adapter for Bun, Deno, and Cloudflare Workers.
• Next.js App Router Adapter (@codebygarv/express-lens/next): withExpressLens HOF and dashboardRoute catch-all handler.
• Express Subpath Export (@codebygarv/express-lens/express): Dedicated Express subpath export.
• Multi-Entry Build: Updated tsup.config.ts to build CJS, ESM, and .d.ts for all subpath entry points.

Verification

• npm run typecheck (0 errors)
• npm test (32/32 tests passing)
• npm run build (Multi-entry CJS, ESM, and .d.ts bundles built)