Fix RelayReg API: heartbeat/unregisterHost now require wgIP per relay contract

src/wg/relayreg.h

@@ -1,5 +1,5 @@
 #pragma once
-// src/wg/relayreg.h — DragonRelay HTTP registration client for Artemis.
+// src/wg/relayreg.h - DragonRelay HTTP registration client for Artemis.
 //
 // Artemis (the Sunshine fork) uses this to:
 //   1. Authenticate with the DragonRelay server (POST /api/auth/login)
@@ -10,6 +10,10 @@
 //
 // Built on libcurl (synchronous, no event loop dependency).
 // The caller is responsible for starting heartbeats in a background thread.
+//
+// IMPORTANT: heartbeat() and unregisterHost() require the local WireGuard IP
+// (wgIP) so the relay can validate ownership.  The relay rejects requests
+// without this field with HTTP 400.
 
 #include "displayinfo.h"
 
@@ -52,12 +56,8 @@ public:
 
     // ── VPN provisioning ──────────────────────────────────────────────────────
 
-    // Request a new WireGuard peer from DragonRelay.
-    // deviceName is appended to username: "user@devicename".
-    // Returns false and sets errOut on failure.
     bool provisionVPN(const std::string &deviceName, VPNConf &out, std::string &errOut);
 
-    // Delete a previously provisioned peer (cleanup on re-provision or shutdown).
     bool deleteVPNPeer(const std::string &peerId, std::string &errOut);
 
     // ── Host registration ─────────────────────────────────────────────────────
@@ -72,19 +72,18 @@ public:
                       std::string &errOut);
 
     // Must be called every ~60 seconds to keep the host visible (5-min TTL).
-    bool heartbeat(std::string &errOut);
+    // wgIP is required so the relay can validate ownership.
+    bool heartbeat(const std::string &wgIP, std::string &errOut);
 
     // Called on Artemis shutdown.
-    bool unregisterHost(std::string &errOut);
+    // wgIP is required so the relay can validate ownership.
+    bool unregisterHost(const std::string &wgIP, std::string &errOut);
 
 private:
     std::string m_base;
     std::string m_jwt;
     LogFn       m_log;
 
-    // Perform a JSON HTTP request.  method: "GET","POST","PUT","DELETE".
-    // body: JSON string to send (empty = no body).
-    // Returns HTTP status code; responseOut is set to the response body.
     int request(const std::string &method,
                 const std::string &path,
                 const std::string &body,