Fix plugin routing, missing includes, and make SCRIPTS_DIR configurable

- Rename varaverk.page → Varaverk.page: unRAID nginx only routes URLs
  starting with a capital letter (~^/[A-Z].*), lowercase caused 404
- Add require_once config.php to include/scheduler.php and include/docs.php:
  both used SCRIPTS_DIR constant without including the file that defines it
- Replace hardcoded SCRIPTS_DIR with cfg-file-backed setting: reads from
  /boot/config/plugins/varaverk/varaverk.cfg, falls back to default on first run
- Add Plugin Settings card to Config tab with scripts path field
- Add api/settings.php to write the cfg file (validates directory exists)

Plugin/usr/local/emhttp/plugins/varaverk/pages/config.php

@@ -3,10 +3,25 @@ require_once dirname(__DIR__) . '/include/config.php';
 $files = vv_get_conf_files();
 $active = $_GET['conf'] ?? ($files[0] ?? '');
 if (!in_array($active, $files)) $active = $files[0] ?? '';
+$currentScriptsDir = SCRIPTS_DIR;
 ?>
 
 <div id="vv-config">
 
+  <!-- Plugin Settings -->
+  <div class="vv-card vv-wide" style="margin-bottom:16px;">
+    <h3>Plugin Settings</h3>
+    <div class="vv-job-row" style="max-width:700px;gap:8px;">
+      <label style="color:#aaa;font-size:13px;white-space:nowrap;">Scripts directory</label>
+      <input type="text" id="vv-scripts-dir" value="<?= htmlspecialchars($currentScriptsDir) ?>"
+             style="flex:1;background:#111;border:1px solid #444;color:#ddd;padding:4px 8px;
+                    border-radius:4px;font-family:monospace;font-size:13px;">
+      <button type="button" onclick="vvSaveSettings()" style="padding:4px 14px;background:#4caf50;
+              border:none;color:#fff;border-radius:4px;cursor:pointer;font-size:13px;">Save</button>
+      <span id="vv-settings-status" style="font-size:13px;color:#aaa;"></span>
+    </div>
+  </div>
+
   <!-- File selector -->
   <div id="vv-conf-tabs">
     <?php foreach ($files as $f): ?>
@@ -35,6 +50,21 @@ if (!in_array($active, $files)) $active = $files[0] ?? '';
 </div>
 
 <script>
+function vvSaveSettings() {
+  const dir    = document.getElementById('vv-scripts-dir').value.trim();
+  const status = document.getElementById('vv-settings-status');
+  if (!dir) { status.textContent = '✗ Path required'; return; }
+  status.textContent = 'Saving...';
+  fetch('/plugins/varaverk/api/settings.php', {
+    method: 'POST',
+    headers: {'Content-Type': 'application/json'},
+    body: JSON.stringify({scripts_dir: dir})
+  })
+  .then(r => r.json())
+  .then(d => { status.textContent = d.ok ? '✓ Saved — reload to apply' : '✗ ' + (d.error ?? 'Error'); })
+  .catch(() => { status.textContent = '✗ Request failed'; });
+}
+
 function vvSaveConf() {
   const form    = document.getElementById('vv-conf-form');
   const file    = form.querySelector('[name=file]').value;