feat: Hono framework support for all providers

[Blankll]

Summary

Add Hono framework support to serverless-adapter. Hono uses Web API Request/Response (not Node.js http streams), so a new honoHandler bridges ServerlessRequest → Web API Request → app.fetch() → Web API Response → ServerlessResponse.

Changes

Core Implementation

• src/framework.ts: Added honoHandler() function and .fetch duck-type detection before existing Koa/Express checks
• src/index.ts: Widened app type to accept HonoApp; HandlerResult includes multiValueHeaders
• src/types/index.ts: Added HonoApp type; ServerlessResponse and ServerlessAdapter include multiValueHeaders

Provider Response Pipeline (multiValueHeaders)

• src/types/aliyun.ts, src/types/tencent.ts, src/types/volcengine.ts: Added multiValueHeaders to response types
• src/providers/aliyun.ts, src/providers/tencent.ts, src/providers/volcengine.ts: formatResponse() now passes through multiValueHeaders
• src/transport.ts: sanitizeHeaders keeps multi-value set-cookie in multiValueHeaders only (RFC 6265 compliance)

Testing

• Unit tests: Hono detection + handler round-trip + type acceptance (3 tests)
• Aliyun integration: 21 scenarios (happy, status codes, query/path params, JSON/text/raw/binary/base64 bodies, headers, set-cookie, 404, 500, methods, isBase64Encoded flag)
• Tencent integration: 7 scenarios (happy, JSON body, query params, custom headers, 404, 500, response format)
• Volcengine integration: 7 scenarios (same coverage)

Documentation

• Hono 4.x added to Supported Frameworks table
• Hono quickstart example
• API Reference updated with Hono type
• Node >= 18 requirement documented

Key Design Decisions

1. No Hono dependency in production code — duck-typing via typeof app.fetch === "function"
2. Detection order: Hono (fetch) → Koa (callback) → Express (function) — prevents false positives
3. Node 18/20+ compatibility: getSetCookie() used on Node 20+; Headers.forEach fallback on Node 18
4. Set-Cookie handling: Single cookies → headers as string; multiple → multiValueHeaders as array (RFC-compliant)

Fixes #14

[codecov]

Codecov Report

❌ Patch coverage is 88.88889% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 92.68%. Comparing base (30e98f4) to head (799a324).

Files with missing lines	Patch %	Lines
src/framework.ts	88.88%	2 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #15      +/-   ##
==========================================
- Coverage   93.17%   92.68%   -0.50%     
==========================================
  Files          13       13              
  Lines         293      328      +35     
  Branches       59       72      +13     
==========================================
+ Hits          273      304      +31     
- Misses         15       17       +2     
- Partials        5        7       +2     

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