POST requests

[rartino]

No description provided.

[Copilot]

Pull request overview

This PR extends the ASGI runtime to accept POST requests and makes POST body parameters available to the site rendering pipeline (function injection + template context), enabling server-rendered pages to react to form/JSON submissions.

Changes:

• Add an HttpRequestContext model to carry method/query/postvars/headers through rendering.
• Update ASGI runtime to accept POST and extract POST variables from urlencoded, JSON, and multipart requests.
• Update function injection to validate/execute against merged input parameters (query + postvars) and adjust warning text; add a POST form test.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
tests/test_publish_warnings.py	Updates expected warning substring to match new wording.
tests/test_functions.py	Adds coverage for function injection using POST form parameters.
src/httk/web/runtime/asgi.py	Enables POST requests and implements POST body extraction into request context.
src/httk/web/model/request.py	Introduces HttpRequestContext dataclass for request-scoped data.
src/httk/web/model/init.py	Exports HttpRequestContext from the model package.
src/httk/web/functions/python_module.py	Renames function handler argument from query to params to reflect merged inputs.
src/httk/web/engine/site_engine.py	Accepts request context, adds postvars/request to template context, and merges params for function injection.

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