Add Admin section to System: reclaim space from unwatched shows

Cross-references Sonarr's per-series disk usage against Tautulli's full
play history to surface the 10 largest shows nobody has ever watched,
excluding anything added in the last 6 months so new downloads aren't
flagged before they've had a chance to be watched. Delete removes the
series from Sonarr along with its episode files and folder, behind the
site's usual two-tap arm/confirm rather than a native dialog.

Also dedupes the never-wired /api/tautulli/never-watched endpoint onto
the same helper, and clears the Sonarr/Radarr list caches on delete so
a removed title doesn't linger in other cards until the TTL expires.

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

static/js/service.js

@@ -234,6 +234,75 @@
     armed = btn;
   };
 
+  /* ── Admin: delete unwatched (P105) ───────────────────
+     Removing a series from Sonarr with its files is permanent,
+     so it shares the same two-tap arming as everything else here
+     rather than a native confirm(). Each row carries its own byte
+     count, so the reclaimable total in the field meta can be
+     recomputed client-side after a delete instead of going stale
+     until the next page load. */
+  function fmtBytes(b) {
+    if (b >= 1073741824) return (b / 1073741824).toFixed(1) + ' GB';
+    return (b / 1048576).toFixed(0) + ' MB';
+  }
+
+  function settleAdmin() {
+    var list = document.getElementById('admin-rows');
+    var meta = document.getElementById('admin-meta');
+    var rows = list ? list.querySelectorAll('.tt-row') : [];
+    var total = 0;
+    for (var i = 0; i < rows.length; i++) total += parseInt(rows[i].dataset.bytes, 10) || 0;
+    if (meta) meta.textContent = rows.length + ' unwatched · ' + fmtBytes(total) + ' reclaimable';
+    if (rows.length === 0 && list) {
+      var empty = document.createElement('p');
+      empty.className = 'tt-empty';
+      empty.id = 'admin-empty';
+      empty.textContent = 'Nothing left to reclaim.';
+      list.parentNode.replaceChild(empty, list);
+    }
+  }
+
+  window.armDelete = function (btn) {
+    if (btn.disabled) return;
+    if (armed && armed !== btn) disarm();
+
+    if (armed === btn) {
+      var row = btn.closest('.tt-row');
+      btn.disabled = true;
+      btn.classList.remove('armed');
+      btn.textContent = 'DELETING';
+      armed = null;
+
+      fetch(BASE + '/api/delete/show', {
+        method: 'POST',
+        headers: { 'Content-Type': 'application/json' },
+        body: JSON.stringify({ sonarr_id: btn.dataset.id })
+      })
+        .then(function (r) { return r.json(); })
+        .then(function (d) {
+          if (d && d.success) {
+            if (row && row.parentNode) row.parentNode.removeChild(row);
+            settleAdmin();
+          } else {
+            btn.disabled = false;
+            btn.classList.add('armed');
+            btn.textContent = 'FAILED';
+          }
+        })
+        .catch(function () {
+          btn.disabled = false;
+          btn.classList.add('armed');
+          btn.textContent = 'FAILED';
+        });
+      return;
+    }
+
+    btn.dataset.label = btn.textContent.trim();
+    btn.classList.add('armed');
+    btn.textContent = 'CONFIRM?';
+    armed = btn;
+  };
+
   document.addEventListener('click', function (e) {
     if (armed && !armed.contains(e.target)) disarm();
   });