feat(landing): Python logging levels guide - #1574

🟡 Confidence 6/10 · needs attention. Held at 6 because a correctness warning is open.
_{1 warning −1 · tests missing −2 · risk medium · 1 defect fixed in earlier rounds}

Adds the Python logging levels guide, new console/python-logging/loguru-output highlighter modes and a LanguageTabs storage-key prop; the snippets and token usage check out. Still open: the earlier /guides/loguru link, which 404s until the parallel guide merges.

• highlight gains console, python-logging, loguru-output, nrql, shell, json, javascript modes
• LanguageTabs takes a group prop as the tab storage key
• New /guides/python-logging-levels page, listed on /guides and in llms.txt
• instrumentation-python.md now says to call setLevel instead of basicConfig after the telemetry handler

Before merge

• Env var · Set LOG_LEVEL in every environment, or confirm its default · apps/landing/src/pages/guides/python-logging-levels.astro:103
• Manual · Merge the /guides/loguru guide with or before this one so the link at line 470 resolves

Still open from earlier reviews

• 🟠 Warning · F1 · Link to /guides/loguru has no page in this repository · apps/landing/src/pages/guides/python-logging-levels.astro:541

Production impact

_{3e7c5ed · Reply "won't fix" to dismiss a finding, or mention @maple-review-bot to ask about one.}