chore: import upstream snapshot with attribution

backend/go/vibevoice-cpp/cpp/govibevoicecpp.cpp

@@ -0,0 +1,41 @@
+// vibevoice.cpp ships its purego-friendly ABI in vibevoice_capi.h.
+// This translation unit is intentionally tiny: pulling in the header
+// (and linking libvibevoice PRIVATE in CMake) is enough to make the
+// vv_capi_* symbols visible from the produced MODULE library.
+//
+// We do install a ggml log redirect so backend logs land on the gRPC
+// server's stderr — same pattern as backend/go/qwen3-tts-cpp/cpp/.
+
+#include "govibevoicecpp.h"
+
+#include "ggml.h"
+#include "ggml-backend.h"
+
+#include <cstdio>
+
+namespace {
+
+void govibevoice_log_cb(enum ggml_log_level level, const char* msg, void* /*ud*/) {
+    if (!msg) return;
+    const char* tag = "?????";
+    switch (level) {
+    case GGML_LOG_LEVEL_DEBUG: tag = "DEBUG"; break;
+    case GGML_LOG_LEVEL_INFO:  tag = "INFO";  break;
+    case GGML_LOG_LEVEL_WARN:  tag = "WARN";  break;
+    case GGML_LOG_LEVEL_ERROR: tag = "ERROR"; break;
+    default: break;
+    }
+    std::fprintf(stderr, "[%-5s] %s", tag, msg);
+    std::fflush(stderr);
+}
+
+struct LogInstaller {
+    LogInstaller() {
+        ggml_log_set(govibevoice_log_cb, nullptr);
+        ggml_backend_load_all();
+    }
+};
+
+LogInstaller g_install;
+
+}  // namespace