Show who requested each show on Admin rows

Sonarr has no concept of a requester, so this cross-references Ombi's
TV request list by title to attribute the show to whoever's request
triggered the grab, falling back to "Requester unknown" for anything
added straight in Sonarr or when Ombi can't be reached.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LPJxtE9tPURsaWDZ6rC4Dt

templates/system.html

@@ -186,7 +186,7 @@
         <span class="tt-row-name">{{ show.ep_count }} EP</span>
         <span class="tt-row-body">
           <span class="tt-row-title">{{ show.title }}</span>
-          <span class="tt-row-sub">{% if show.year %}{{ show.year }} &middot; {% endif %}Downloaded {{ show.added[:10] if show.added else 'unknown' }} &middot; Never watched</span>
+          <span class="tt-row-sub">{% if show.year %}{{ show.year }} &middot; {% endif %}Downloaded {{ show.added[:10] if show.added else 'unknown' }} &middot; {% if show.requested_by %}Requested by {{ show.requested_by }}{% else %}Requester unknown{% endif %} &middot; Never watched</span>
         </span>
         <span class="tt-row-val">{{ show.size_display }}</span>
         <span class="tt-row-acts">