fix: wireguard health_check error + logs page ALL service + rotate confirmation

- WireGuardManager.test_connectivity: make peer_ip optional so health_check
  can call it without args (was logging ERROR on every health poll)
- Logs page: add ALL option to service selector (uses search across all services)
- Logs page: show service tag on each log line when in ALL/search mode
- Logs page: require window.confirm before rotating logs to prevent accidental data loss

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

api/wireguard_manager.py

@@ -507,8 +507,11 @@ class WireGuardManager(BaseServiceManager):
         except Exception as e:
             return self.handle_error(e, 'get_status')
 
-    def test_connectivity(self, peer_ip: str) -> Dict[str, Any]:
-        """Ping a peer IP and return results."""
+    def test_connectivity(self, peer_ip: str = None) -> Dict[str, Any]:
+        """Ping a peer IP and return results. Called with no args from health_check."""
+        if not peer_ip:
+            status = self.get_status()
+            return {'reachable': status.get('running', False), 'status': status.get('status')}
         try:
             result = subprocess.run(
                 ['ping', '-c', '1', '-W', '2', peer_ip],