Add Raven Dashboard: CPU, memory and Winners history

[sr320]

New Raven Dashboard page (next to Gannet Dashboard in the nav), built from raven's daily ghr.log snapshot.

Data

• fetch_raven_stats now also parses memory_percent, the Winners list (top 5 accounts by summed %CPU, with %MEM), and the top memory processes.
• Raven overwrites ghr.log daily with no dated copies, so check_servers.py --out now maintains status/raven_history.json on the server-status branch: one entry per snapshot date (CPU, memory, per-mount %, Winners), capped at 365 days. publish_status.sh already checks out the branch first, so the file carries forward. History starts from the first run after merge.

Page (docs/Raven-Dashboard.md, docs/javascripts/raven-dashboard.js)

• Tiles: CPU, memory, fullest drive, top (non-system) user.
• Line chart of CPU % and memory % by day (shared chart from gannet-health.js).
• Winners: latest table, plus a user × day grid of appearances, shaded by CPU, with a day count per user. System accounts (root, mysql, rstudio+…) are listed last in gray.
• Current top-memory processes and drive table.
• Computing Hardware links to it from the raven row and the Raven Disk / CPU section.

Tested the parser against the live ghr.log and rendered the page locally with 21 days of synthetic history.

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