fix(stt): align build script binary names with gpuDetector expectations

binaryNameForBackend('ctranslate2-cpu') → 'ctranslate2-server-ctranslate2-cpu.exe'
but build scripts produced 'ctranslate2-server-cpu.exe' (missing ctranslate2- prefix).

- ct2-build.cmd: copy output to ctranslate2-server-ctranslate2-cpu.exe
- scripts/build-ctranslate2-server.sh: variant names cpu→ctranslate2-cpu, cuda→ctranslate2-cuda

Author: EtienneLescot

ct2-build.cmd

@@ -5,5 +5,5 @@ cmake -S electron\native\ctranslate2-server -B .cache\ctranslate2-build\build-cp
 if errorlevel 1 exit /b %errorlevel%
 cmake --build .cache\ctranslate2-build\build-cpu --config Release
 if errorlevel 1 exit /b %errorlevel%
-copy /Y .cache\ctranslate2-build\build-cpu\ctranslate2-server.exe electron\native\bin\win32-x64\ctranslate2-server-cpu.exe
+copy /Y .cache\ctranslate2-build\build-cpu\ctranslate2-server.exe electron\native\bin\win32-x64\ctranslate2-server-ctranslate2-cpu.exe
 echo Build complete.

scripts/build-ctranslate2-server.sh

@@ -32,8 +32,8 @@ VARIANTS=()
 while [[ $# -gt 0 ]]; do
   case "$1" in
     --cpu-only) CPU_ONLY=1; shift ;;
-    --cuda) VARIANTS+=("cuda"); shift ;;
-    --cpu) VARIANTS+=("cpu"); shift ;;
+    --cuda) VARIANTS+=("ctranslate2-cuda"); shift ;;
+    --cpu) VARIANTS+=("ctranslate2-cpu"); shift ;;
     -h|--help)
       cat <<-EOF
 		Usage: $0 [--cpu-only | --cuda --cpu]
@@ -50,22 +50,22 @@ done
 
 if [[ "${#VARIANTS[@]}" -eq 0 && "${CPU_ONLY}" -eq 0 ]]; then
   case "$(uname -s):$(uname -m)" in
-    Darwin:arm64|Darwin:x86_64) VARIANTS+=(cpu) ;;
+    Darwin:arm64|Darwin:x86_64) VARIANTS+=(ctranslate2-cpu) ;;
     Linux:x86_64|Linux:aarch64)
-      if command -v nvcc >/dev/null 2>&1; then VARIANTS+=(cuda); fi
-      VARIANTS+=(cpu)
+      if command -v nvcc >/dev/null 2>&1; then VARIANTS+=(ctranslate2-cuda); fi
+      VARIANTS+=(ctranslate2-cpu)
       ;;
     MINGW*|CYGWIN*|MSYS*)
       # CUDA on Windows only ships when self-hosted GPU runners exist; the
       # workflow gates this on `ENABLE_CUDA`.
-      VARIANTS+=(cpu)
+      VARIANTS+=(ctranslate2-cpu)
       ;;
-    *) VARIANTS+=(cpu) ;;
+    *) VARIANTS+=(ctranslate2-cpu) ;;
   esac
 fi
 
 if [[ "${CPU_ONLY}" -eq 1 ]]; then
-  VARIANTS=(cpu)
+  VARIANTS=(ctranslate2-cpu)
 fi
 
 echo "Variants to build: ${VARIANTS[*]:-none}"