feat(voice): add QoS stubs (GetStatus, Terminate, SetMode) (#541)

* feat(voice): add QoS stubs (GetStatus, Terminate, SetMode)

Titles call these functions during voice/multiplayer setup to check
network availability and configure modes. Unresolved imports caused
WARN floods in the loader logs. Reporting initialized + disconnected
lets callers take their normal offline path.

* fix(voice): return success (0) from sceVoiceQoSGetStatus instead of disconnected state

src/SharpEmu.Libs/Voice/VoiceQoSExports.cs

@@ -16,4 +16,37 @@ public static class VoiceQoSExports
     {
         return ctx.SetReturn(0);
     }
+
+    [SysAbiExport(
+        Nid = "Trpt2QBZHCI",
+        ExportName = "sceVoiceQoSGetStatus",
+        Target = Generation.Gen4 | Generation.Gen5,
+        LibraryName = "libSceVoiceQoS")]
+    public static int VoiceQoSGetStatus(CpuContext ctx)
+    {
+        // Returns 0 to indicate connected state (voice available)
+        return ctx.SetReturn(0);
+    }
+
+    [SysAbiExport(
+        Nid = "FuXenJLkk-c",
+        ExportName = "sceVoiceQoSTerminate",
+        Target = Generation.Gen4 | Generation.Gen5,
+        LibraryName = "libSceVoiceQoS")]
+    public static int VoiceQoSTerminate(CpuContext ctx)
+    {
+        // No-op: cleanup is handled by emulator shutdown
+        return ctx.SetReturn(0);
+    }
+
+    [SysAbiExport(
+        Nid = "+0lOiPZjnBI",
+        ExportName = "sceVoiceQoSSetMode",
+        Target = Generation.Gen4 | Generation.Gen5,
+        LibraryName = "libSceVoiceQoS")]
+    public static int VoiceQoSSetMode(CpuContext ctx)
+    {
+        // No-op: mode configuration is not emulated
+        return ctx.SetReturn(0);
+    }
 }