Varaverk: rsync flag toggle + stop button

- Rsync/rsync.sh children in Advanced now show as conf_flag type when the
  parent orch controls a *_RSYNC_ENABLED tier flag; toggle writes true/false
  to master.conf instead of comment/uncommenting a SCRIPTS array entry
- Added vv_conf_flag_value() and vv_conf_flag_set() helpers in scheduler.php
- Added api/flag_toggle.php endpoint (validates *_RSYNC_ENABLED pattern)
- Added api/stop.php: kills process group, sweeps stuck locks, updates stat
- vv-flag-badge CSS (amber, monospace) to distinguish from event/script rows
- vvSaveChild() routes conf_flag children to flag_toggle.php unconditionally
- vvApplyOrchState() keeps conf_flag toggle at real flag value; disables when orch off
- vvSaveAll() skips conf_flag children (immediate-save only)

Plugin/usr/local/emhttp/plugins/varaverk/include/scheduler.php

@@ -324,6 +324,30 @@ function vv_conf_script_map(): array {
     return $cache = $map;
 }
 
+// Read a boolean flag value (e.g. INTERMEDIATE_RSYNC_ENABLED) from master.conf.
+function vv_conf_flag_value(string $name): bool {
+    $conf = file_get_contents(CONF_DIR . '/master.conf') ?: '';
+    if (preg_match('/^\s*' . preg_quote($name, '/') . '\s*=\s*(true|false)\s*$/m', $conf, $m)) {
+        return $m[1] === 'true';
+    }
+    return false;
+}
+
+// Write a boolean flag value to master.conf.
+function vv_conf_flag_set(string $name, bool $value): bool {
+    $confPath = CONF_DIR . '/master.conf';
+    $content  = file_get_contents($confPath);
+    if ($content === false) return false;
+    $val      = $value ? 'true' : 'false';
+    $new      = preg_replace(
+        '/^(\s*' . preg_quote($name, '/') . '\s*=\s*)(true|false)(\s*(?:#.*)?)$/m',
+        '${1}' . $val . '${3}',
+        $content, -1, $count
+    );
+    if (!$count) return false;
+    return file_put_contents($confPath, $new) !== false;
+}
+
 // Comment or uncomment a script's line in the first master.conf array that contains it.
 function vv_conf_toggle_script(string $rel, bool $enable): bool {
     $confPath = CONF_DIR . '/master.conf';
@@ -365,6 +389,12 @@ function vv_script_children(string $orchPath, array $schedule): array {
     $seen       = [];
     $confMap    = vv_conf_script_map();
 
+    // Detect which tier rsync flag this orch controls (e.g. "INTERMEDIATE" → INTERMEDIATE_RSYNC_ENABLED)
+    $rsyncFlagName = null;
+    if (preg_match('/check_rsync_enabled\s+"([A-Z]+)"/', $content, $rm)) {
+        $rsyncFlagName = $rm[1] . '_RSYNC_ENABLED';
+    }
+
     $addChild = function(string $rel) use ($scriptsDir, $schedule, $confMap, &$children, &$seen) {
         if (isset($seen[$rel]) || !file_exists("$scriptsDir/$rel")) return;
         $seen[$rel]  = true;
@@ -399,5 +429,18 @@ function vv_script_children(string $orchPath, array $schedule): array {
         }
     }
 
+    // Annotate Rsync/rsync.sh as a conf_flag child if this orch controls a rsync tier flag
+    if ($rsyncFlagName) {
+        foreach ($children as &$c) {
+            if ($c['id'] === 'Rsync/rsync.sh') {
+                $c['type']       = 'conf_flag';
+                $c['flag_name']  = $rsyncFlagName;
+                $c['flag_value'] = vv_conf_flag_value($rsyncFlagName);
+                break;
+            }
+        }
+        unset($c);
+    }
+
     return $children;
 }