feat: 重构压缩 API 为 responseMode 无状态契约

[zzgosh]

变更概述

将 POST /api/image-compress/v1/compress 从“成功直接返回二进制（语义藏在 headers）”重构为更适合自动化编排的无状态接口：

• 新增显式 responseMode=metadata|binary（默认 metadata）
• metadata：仅返回结构化 JSON 元信息（success/compressed/outcome/reason + 体积统计 + results[]），便于 Shortcuts/脚本/Agent 做稳定 if/else
• binary：继续流式返回单图或 ZIP；headers 仅作为辅助信息，并补充 X-Compressed / X-Outcome

说明：HTTP 200 仅表示请求处理成功，不代表一定变小；请以 compressed/outcome 判断。

契约更新

• OpenAPI：补齐 CompressMetadataResponse（single/zip 两种 schema）以及 responseMode 参数说明
• README：补齐 responseMode 用法与 cURL 示例

回归验证

• npm run check && npm run build
• curl：
  • ?responseMode=metadata 检查 JSON 字段（尤其是 compressed/outcome/reason）
  • ?responseMode=binary 检查单图/多图 ZIP、Content-Disposition 与辅助 headers

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[zzgosh]

@codex reviewer the new commit

[chatgpt-codex-connector]

Summary

• Added a reusable helper to build multipart payloads with multiple files parts, so mixed-outcome multi-file route behavior can be tested in one request path. tests/compress.test.tsL90-L110
• Added a new regression test that verifies top-level metadata outcome aggregation for mixed results (one rotated file kept as processed output + one non-rotated fallback), asserting compressed=true and outcome=compressed. tests/compress.test.tsL223-L265
• Extended the same mixed-case test to verify binary mode headers (X-Compressed, X-Outcome) remain consistent with the aggregated outcome logic. tests/compress.test.tsL266-L279
• Committed the follow-up change on the current branch (fa7b034) and created a PR via make_pr titled: test: add regression coverage for mixed compressed/fallback summary outcome.

Testing

• ✅ npm test
• ✅ npm run check && npm run build
• ⚠️ curl -L 'https://duckduckgo.com/html/?q=sharp+rotate+exif+orientation+output+larger+fallback' -o /tmp/web_search.html && wc -c /tmp/web_search.html (network/proxy restriction: CONNECT tunnel failed, response 403)

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