fix(web): stop dumping the config and request headers to the journal

[ChuckBuilds]

save_main_config logged its whole POST body and full request headers at ERROR, on every save:

logging.error(f"DEBUG: save_main_config received data: {data}")
logging.error(f"DEBUG: Content-Type header: {request.content_type}")
logging.error(f"DEBUG: Headers: {dict(request.headers)}")

The body is the configuration itself; the headers carry the session cookie. A routine settings change wrote both to the journal, at a level that survives any sane log filter.

They are leftover debug output — they say DEBUG: in the message while calling logging.error, and they use the root logger rather than the module logger, so the level configured for this blueprint never applied.

Replaced with a logger.debug line recording the request's shape, which is the part with diagnostic value. The local import logging went too: it shadowed a module-level import already present at line 13.

260 web tests pass.

Found while investigating #478, which fixes the credential erasure in the same function.

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Reviewing files that changed from the base of the PR and between cf0a551 and f0efdaf.

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• web_interface/blueprints/api_v3.py

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[codacy-production]

Up to standards ✅

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[ChuckBuilds]

Superseded by #485, which combines the seven api_v3.py PRs so they do not conflict with each other. Every change from this PR is verified present on that branch; the branch here is untouched if you want to compare.