Add Palworld player count and list support via RCON

- Add ShowPlayers RCON command handling for Palworld servers
- Update SSH access documentation with jump host instructions

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

gsm-backend/services/rcon.js

@@ -87,6 +87,11 @@ export async function getPlayers(server) {
       // Count lines that contain player info
       const lines = response.split('\n').filter(l => l.trim() && !l.includes('listusers'));
       result = { online: lines.length, max: null };
+    } else if (server.type === 'palworld') {
+      const response = await sendRconCommand(server, 'ShowPlayers');
+      // Format: "name,playeruid,steamid\nPlayer1,123,765...\nPlayer2,456,765..."
+      const lines = response.split('\n').filter(l => l.trim() && !l.toLowerCase().startsWith('name,'));
+      result = { online: lines.length, max: null };
     }
 
     playerCache.set(cacheKey, { data: result, time: Date.now() });
@@ -145,6 +150,16 @@ export async function getPlayerList(server) {
       // Parse player names from listusers output
       const lines = response.split('\n').filter(l => l.trim() && !l.includes('listusers'));
       players = lines.map(l => l.trim()).filter(p => p);
+    } else if (server.type === 'palworld') {
+      const response = await sendRconCommand(server, 'ShowPlayers');
+      // Format: "name,playeruid,steamid\nPlayer1,123,765...\nPlayer2,456,765..."
+      const lines = response.split('\n').filter(l => l.trim() && !l.toLowerCase().startsWith('name,'));
+      for (const line of lines) {
+        const parts = line.split(',');
+        if (parts.length >= 1 && parts[0].trim()) {
+          players.push(parts[0].trim());
+        }
+      }
     }
 
     const result = { players };