fix(whisper): honor bundled GPU libs and skip software Vulkan devices (#674)

* fix(whisper): use bundled GPU libs and skip software Vulkan devices

AppImage 0.15.0 shipped a CPU-only pywhispercpp wheel, so the Settings
GPU picker and host vulkaninfo never moved inference off the CPU. Rebuild
pywhispercpp with Vulkan in the AppImage, log the libraries that actually
load, skip llvmpipe in auto-select, and document how to verify.

Fixes #604

* fix(appimage): pin gcc/g++ for Vulkan pywhispercpp rebuild

Hosts that default cc/c++ to clang fail CMAKE's C++ test because clang
does not search gcc's libstdc++ path. Default the rebuild to gcc/g++.

.github/workflows/nightly.yml

@@ -49,7 +49,12 @@ jobs:
             gir1.2-rsvg-2.0 \
             librsvg2-common \
             libdbusmenu-gtk3-4 \
-            libnotify4
+            libnotify4 \
+            cmake \
+            ninja-build \
+            build-essential \
+            libvulkan-dev \
+            glslc
 
       - name: Install build dependencies
         run: |
@@ -97,6 +102,8 @@ jobs:
           ls -la dist/
 
       - name: Build AppImage (x86_64)
+        env:
+          VOCALINUX_APPIMAGE_REQUIRE_VULKAN: "1"
         run: |
           bash packaging/appimage/build.sh dist/*.whl "${{ steps.version.outputs.version }}" dist
           ls -la dist/*.AppImage
@@ -298,7 +305,12 @@ jobs:
             gir1.2-rsvg-2.0 \
             librsvg2-common \
             libdbusmenu-gtk3-4 \
-            libnotify4
+            libnotify4 \
+            cmake \
+            ninja-build \
+            build-essential \
+            libvulkan-dev \
+            glslc
 
       - name: Install build dependencies
         run: |
@@ -310,6 +322,8 @@ jobs:
           ls -la dist/
 
       - name: Build AppImage (aarch64)
+        env:
+          VOCALINUX_APPIMAGE_REQUIRE_VULKAN: "1"
         run: |
           bash packaging/appimage/build.sh dist/*.whl "${{ needs.nightly.outputs.version }}" dist
           ls -la dist/*.AppImage

.github/workflows/release.yml

@@ -49,7 +49,12 @@ jobs:
             gir1.2-rsvg-2.0 \
             librsvg2-common \
             libdbusmenu-gtk3-4 \
-            libnotify4
+            libnotify4 \
+            cmake \
+            ninja-build \
+            build-essential \
+            libvulkan-dev \
+            glslc
 
       - name: Install build dependencies
         run: |
@@ -82,6 +87,8 @@ jobs:
           ls -la dist/
 
       - name: Build AppImage (x86_64)
+        env:
+          VOCALINUX_APPIMAGE_REQUIRE_VULKAN: "1"
         run: |
           bash packaging/appimage/build.sh dist/*.whl "${{ steps.get_version.outputs.VERSION }}" dist
           ls -la dist/*.AppImage
@@ -177,7 +184,12 @@ jobs:
             gir1.2-rsvg-2.0 \
             librsvg2-common \
             libdbusmenu-gtk3-4 \
-            libnotify4
+            libnotify4 \
+            cmake \
+            ninja-build \
+            build-essential \
+            libvulkan-dev \
+            glslc
 
       - name: Install build dependencies
         run: |
@@ -196,6 +208,8 @@ jobs:
           ls -la dist/
 
       - name: Build AppImage (aarch64)
+        env:
+          VOCALINUX_APPIMAGE_REQUIRE_VULKAN: "1"
         run: |
           bash packaging/appimage/build.sh dist/*.whl "${{ steps.get_version.outputs.VERSION }}" dist
           ls -la dist/*.AppImage

.github/workflows/unified-pipeline.yml

@@ -213,7 +213,12 @@ jobs:
             gobject-introspection \
             libcairo-gobject2 \
             gir1.2-gtk-3.0 \
-            portaudio19-dev
+            portaudio19-dev \
+            cmake \
+            ninja-build \
+            build-essential \
+            libvulkan-dev \
+            glslc
 
       - name: Install GObject introspection dependencies
         run: |
@@ -227,6 +232,8 @@ jobs:
           ls -la dist/
 
       - name: Build AppImage
+        env:
+          VOCALINUX_APPIMAGE_REQUIRE_VULKAN: "1"
         run: |
           VERSION=$(grep -oP '__version__\s*=\s*"\K[^"]+' src/vocalinux/version.py)
           WHEEL=$(ls dist/*.whl)