Fix System page crash, retire "held" copy, and slim CLAUDE.md

- system.html crashed with a 500 whenever SABnzbd history loaded: the
  trend() macro compared the formatted "avg_speed" string (e.g. "900
  KB/s") against a number. Added a real numeric avg_speed_kbps field
  and pointed the macro at that instead.
- Replaced "held"/"not held" wording with "in library"/"not in
  library" on Home and Discover.
- Moved CLAUDE.md's Deployment/reverse-proxy and account-management
  sections into two on-demand skills (deploy-arr-summary,
  manage-accounts) so they only load when actually relevant, with a
  one-line pointer left in their place.
- Updated PRODUCT.md's restructure note now that meridian-marquee has
  merged to main.
- Dropped two stale/broken entries from settings.local.json's
  permission allowlist (a rule from a different machine/path, and one
  with a corrupted token).

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01NBw1QodG8ZMYHrGeQfqyDS

.claude/settings.local.json

@@ -21,9 +21,7 @@
       "Bash(expect:*)",
       "Bash(bash export-to-unraid.sh root@192.168.86.33)",
       "Bash(scp:*)",
-      "Bash(rsync:*)",
-      "Bash(/Users/matt/Desktop/summary/arr-summary/gunicorn.conf.py:*)",
-      "Bash(__NEW_LINE_58e4516f9721fb50__ ssh -o StrictHostKeyChecking=no -o IdentitiesOnly=yes root@192.168.86.33 \"cd /mnt/user/appdata/greendale && docker compose build --no-cache 2>&1 | tail -3 && docker compose up -d 2>&1\")"
+      "Bash(rsync:*)"
     ]
   }
 }