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

app.py

@@ -512,7 +512,8 @@ def _get_sab_history_cached():
             if duration > 0 and size_bytes > 0:
                 speeds.append(size_bytes / duration)
         avg_bytes_per_sec = sum(speeds) / len(speeds) if speeds else 0
-        avg_speed = _format_speed(avg_bytes_per_sec / 1024)
+        avg_speed_kbps = avg_bytes_per_sec / 1024
+        avg_speed = _format_speed(avg_speed_kbps)
         # Keep the newest completed items too — "Landed today" on the home
         # page and the activity feed both read these. Same request as before;
         # previously only the aggregates survived.
@@ -526,12 +527,12 @@ def _get_sab_history_cached():
 
         result = {"week_size": week_size, "day_size": day_size,
                   "completed_7d": completed_7d, "avg_speed": avg_speed,
-                  "recent_items": recent_items}
+                  "avg_speed_kbps": avg_speed_kbps, "recent_items": recent_items}
         _sab_history_cache = {"data": result, "expires": now + 600}
         return result
     except Exception:
         return {"week_size": "—", "day_size": "—", "completed_7d": "—",
-                "avg_speed": "—", "recent_items": []}
+                "avg_speed": "—", "avg_speed_kbps": None, "recent_items": []}
 
 
 def get_sabnzbd_summary():
@@ -565,6 +566,7 @@ def get_sabnzbd_summary():
             "week_size":    hist["week_size"],
             "day_size":     hist["day_size"],
             "avg_speed":    hist["avg_speed"],
+            "avg_speed_kbps": hist["avg_speed_kbps"],
             "recent_items": hist.get("recent_items", []),
         }
     except Exception as e: