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

templates/discover.html

@@ -4,11 +4,11 @@
 
 {% block content %}
   <h1 class="tt-dh bloom tt-masthead">DISCOVER</h1>
-  <p class="tt-empty">Popular right now, with anything already held filtered out.</p>
+  <p class="tt-empty">Popular right now, with anything already in library filtered out.</p>
 
   <div class="tt-field">
     <span>Films</span>
-    <span class="tt-field-meta">{{ rt_movies | length }} not held</span>
+    <span class="tt-field-meta">{{ rt_movies | length }} not in library</span>
   </div>
   {% if rt_movies %}
     <div class="tt-tiles">
@@ -17,12 +17,12 @@
       {% endfor %}
     </div>
   {% else %}
-    <p class="tt-empty">Nothing to suggest &mdash; the feed is unreachable or you already hold it all.</p>
+    <p class="tt-empty">Nothing to suggest &mdash; the feed is unreachable or it's all already in your library.</p>
   {% endif %}
 
   <div class="tt-field">
     <span>Television</span>
-    <span class="tt-field-meta">{{ rt_tv | length }} not held</span>
+    <span class="tt-field-meta">{{ rt_tv | length }} not in library</span>
   </div>
   {% if rt_tv %}
     <div class="tt-tiles">