Add SteamCMD-based updates for V Rising, Palworld, Zomboid, Terraria

- Create generic SteamCMD handler factory for reusable update logic
- Check build IDs via appmanifest files and Steam API
- Support V Rising (1829350), Palworld (2394010), Zomboid (380870), tModLoader (1281930)
- Show update button for all supported server types in UI
- Minecraft, OpenTTD, Hytale marked as manual-update-only

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

gsm-backend/services/serverUpdates.js

@@ -23,6 +23,14 @@ const serverLogos = {
   hytale: 'https://gsm.zeasy.dev/hytale.png'
 };
 
+// Steam App IDs
+const STEAM_APP_IDS = {
+  vrising: 1829350,
+  palworld: 2394010,
+  zomboid: 380870,
+  terraria: 1281930  // tModLoader
+};
+
 // SSH connection helper (reuse existing pattern)
 const sshConnections = new Map();
 const SSH_TIMEOUT = 30000; // Longer timeout for update operations
@@ -78,7 +86,107 @@ async function sendUpdateNotification(server, updateInfo) {
 }
 
 // =============================================================================
-// Update Handler Registry - Add new game handlers here
+// SteamCMD Helper Functions
+// =============================================================================
+
+/**
+ * Get the current installed build ID from Steam appmanifest
+ */
+async function getSteamBuildId(ssh, installDir, appId) {
+  const manifestPath = `${installDir}/steamapps/appmanifest_${appId}.acf`;
+  const result = await ssh.execCommand(`grep -oP '"buildid"\\s*"\\K[^"]+' ${manifestPath} 2>/dev/null`);
+  return result.stdout.trim() || null;
+}
+
+/**
+ * Get the latest available build ID from Steam
+ */
+async function getLatestSteamBuildId(ssh, appId, steamcmdPath = "steamcmd") {
+  // Query Steam for app info
+  const result = await ssh.execCommand(
+    `${steamcmdPath} +login anonymous +app_info_update 1 +app_info_print ${appId} +quit 2>/dev/null | grep -A2 '"public"' | grep '"buildid"' | head -1 | grep -oP '"buildid"\\s*"\\K[^"]+'`,
+    { execOptions: { timeout: 60000 } }
+  );
+  return result.stdout.trim() || null;
+}
+
+/**
+ * Create a generic SteamCMD update handler
+ */
+function createSteamHandler(config) {
+  const { appId, installDir, steamcmdPath = "steamcmd", gameName, sudoUser = null } = config;
+
+  return {
+    supportsUpdate: true,
+    gameName,
+
+    async checkForUpdate(server) {
+      const ssh = await getConnection(server.host, server.sshUser);
+      const actualInstallDir = installDir || server.workDir;
+
+      console.log(`[Update] Checking for ${gameName} updates...`);
+
+      // Get current build ID
+      const currentBuildId = await getSteamBuildId(ssh, actualInstallDir, appId);
+      if (!currentBuildId) {
+        return { hasUpdate: false, error: "Konnte aktuelle Version nicht ermitteln" };
+      }
+
+      // Get latest build ID from Steam
+      const sudoPrefix = sudoUser ? `sudo -u ${sudoUser} ` : "";
+      const latestBuildId = await getLatestSteamBuildId(ssh, appId, sudoPrefix + steamcmdPath);
+
+      if (!latestBuildId) {
+        return { hasUpdate: false, error: "Konnte Steam-Version nicht abrufen" };
+      }
+
+      const hasUpdate = currentBuildId !== latestBuildId;
+
+      return {
+        hasUpdate,
+        currentVersion: currentBuildId,
+        newVersion: latestBuildId,
+        message: hasUpdate ? "Neues Update verfügbar!" : "Server ist auf dem neuesten Stand"
+      };
+    },
+
+    async performUpdate(server) {
+      const ssh = await getConnection(server.host, server.sshUser);
+      const actualInstallDir = installDir || server.workDir;
+
+      // Get old build ID
+      const oldBuildId = await getSteamBuildId(ssh, actualInstallDir, appId);
+
+      console.log(`[Update] Starting ${gameName} update...`);
+
+      // Run SteamCMD update
+      const sudoPrefix = sudoUser ? `sudo -u ${sudoUser} ` : "";
+      const updateResult = await ssh.execCommand(
+        `${sudoPrefix}${steamcmdPath} +login anonymous +force_install_dir "${actualInstallDir}" +app_update ${appId} validate +quit`,
+        { execOptions: { timeout: 600000 } } // 10 min timeout for large updates
+      );
+
+      console.log(`[Update] SteamCMD output:`, updateResult.stdout);
+
+      if (updateResult.code !== 0 && !updateResult.stdout.includes("Success")) {
+        throw new Error("Update fehlgeschlagen: " + (updateResult.stderr || "Unbekannter Fehler"));
+      }
+
+      // Get new build ID
+      const newBuildId = await getSteamBuildId(ssh, actualInstallDir, appId);
+
+      return {
+        success: true,
+        message: "Update erfolgreich! Server kann jetzt gestartet werden.",
+        oldVersion: oldBuildId || "unbekannt",
+        newVersion: newBuildId || "aktuell"
+      };
+    }
+  };
+}
+
+// =============================================================================
+// Update Handler Registry
 // =============================================================================
 
 const updateHandlers = {
@@ -223,22 +331,56 @@ const updateHandlers = {
     }
   },
 
-  // Add more game handlers here in the future
-  // Example template for other games:
-  /*
+  // V Rising (SteamCMD)
+  vrising: createSteamHandler({
+    appId: STEAM_APP_IDS.vrising,
+    installDir: "/home/steam/vrising",
+    steamcmdPath: "/home/steam/steamcmd/steamcmd.sh",
+    gameName: "V Rising"
+  }),
+
+  // Palworld (SteamCMD)
+  palworld: createSteamHandler({
+    appId: STEAM_APP_IDS.palworld,
+    installDir: "/opt/palworld",
+    steamcmdPath: "/usr/games/steamcmd",
+    gameName: "Palworld"
+  }),
+
+  // Project Zomboid (SteamCMD)
+  zomboid: createSteamHandler({
+    appId: STEAM_APP_IDS.zomboid,
+    installDir: "/opt/pzserver",
+    steamcmdPath: "/home/pzuser/steamcmd/steamcmd.sh",
+    gameName: "Project Zomboid",
+    sudoUser: "pzuser"
+  }),
+
+  // Terraria / tModLoader (SteamCMD)
+  terraria: createSteamHandler({
+    appId: STEAM_APP_IDS.terraria,
+    installDir: "/home/terraria/tModLoader",
+    steamcmdPath: "/home/terraria/steamcmd/steamcmd.sh",
+    gameName: "Terraria (tModLoader)"
+  }),
+
+  // Minecraft ATM10 - Manual update required (modpack)
   minecraft: {
-    supportsUpdate: true,
-    gameName: "Minecraft",
-    async checkForUpdate(server) {
-      // Implementation for Minecraft updates
-      return { hasUpdate: false, message: "Not implemented" };
-    },
-    async performUpdate(server) {
-      // Implementation for Minecraft updates
-      return { success: false, message: "Not implemented" };
-    }
+    supportsUpdate: false, // Modpacks need manual update
+    gameName: "Minecraft ATM10"
   },
-  */
+
+  // OpenTTD - Manual update required
+  openttd: {
+    supportsUpdate: false,
+    gameName: "OpenTTD"
+  },
+
+  // Hytale - Manual update required
+  hytale: {
+    supportsUpdate: false,
+    gameName: "Hytale"
+  }
 };
 
 // =============================================================================

gsm-frontend/src/pages/ServerDetail.jsx

@@ -495,8 +495,8 @@ const formatUptime = (seconds) => {
               </div>
             )}
 
-            {/* Server Update */}
-            {isModerator && server.type === 'factorio' && (
+            {/* Server Update - for supported server types */}
+            {isModerator && ['factorio', 'vrising', 'palworld', 'zomboid', 'terraria'].includes(server.type) && (
               <div className="card p-4">
                 <h3 className="text-sm font-medium text-neutral-300 mb-3">Server Update</h3>
                 <p className="text-neutral-500 text-sm mb-4">