Implement an HTTPResponse helper class

[jviotti]

Signed-off-by: Juan Cruz Viotti [email protected]

[augmentcode]

🤖 Augment PR Summary

Summary: This PR introduces an HTTPResponse wrapper and refactors the server request/response flow to centralize response sending and static file serving.

Changes:

• Added HTTPResponse in src/server/response.h, and moved HTTP status string constants there (formerly status.h).
• Refactored server routing code by extracting endpoint logic into new action headers (action_jsonschema_evaluate.h, action_jsonschema_serve.h, action_schema_search.h).
• Introduced action_serve_metapack_file.h to replace the previous serve_static_file helper and unify caching/ETag behavior.
• Extended HTTPRequest to hold the underlying response pointer and added an async body() helper that snapshots method/path for callbacks.
• Updated server.cc to use the new HTTPRequest/HTTPResponse API and adjusted handler indices in sourcemeta/one/shared.h.
• Updated src/server/CMakeLists.txt to include the new/renamed headers.

Technical Notes: Response sending now routes through HTTPResponse::send() to apply content-encoding (gzip/identity) consistently, and static metapack responses share conditional request handling (If-Modified-Since / If-None-Match) via action_serve_metapack_file.

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[augmentcode]

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