Fix Windows build: Use collect_all for FastAPI packages

- On Windows, PyInstaller wasn't properly bundling FastAPI dependencies
- Added platform-specific collection using PyInstaller.utils.hooks.collect_all
- Only applies aggressive collection on Windows to keep Linux builds stable
- Collects all submodules and data files for: fastapi, starlette, pydantic,
  pydantic_core, anyio, uvicorn, websockets, h11
- Linux builds remain unchanged and continue to work as before

Fixes: ModuleNotFoundError: No module named 'fastapi' on Windows executable

local-transcription.spec

@@ -10,75 +10,98 @@ block_cipher = None
 # Determine if we're on Windows
 is_windows = sys.platform == 'win32'
 
+# Import PyInstaller utilities (only needed on Windows for FastAPI fix)
+if is_windows:
+    from PyInstaller.utils.hooks import collect_all
+
 # Find faster_whisper assets folder
 import faster_whisper
 faster_whisper_path = os.path.dirname(faster_whisper.__file__)
 vad_assets_path = os.path.join(faster_whisper_path, 'assets')
 
+# Base configuration
+binaries = []
+datas = [
+    ('config/default_config.yaml', 'config'),
+    (vad_assets_path, 'faster_whisper/assets'),  # Include VAD model
+]
+hiddenimports = [
+    'PySide6.QtCore',
+    'PySide6.QtWidgets',
+    'PySide6.QtGui',
+    'faster_whisper',
+    'faster_whisper.transcribe',
+    'faster_whisper.vad',
+    'ctranslate2',
+    'sounddevice',
+    'noisereduce',
+    'webrtcvad',
+    'scipy',
+    'scipy.signal',
+    'numpy',
+    # FastAPI and dependencies
+    'fastapi',
+    'fastapi.routing',
+    'fastapi.responses',
+    'starlette',
+    'starlette.applications',
+    'starlette.routing',
+    'starlette.responses',
+    'starlette.websockets',
+    'starlette.middleware',
+    'starlette.middleware.cors',
+    'pydantic',
+    'pydantic.fields',
+    'pydantic.main',
+    'anyio',
+    'anyio._backends',
+    'anyio._backends._asyncio',
+    'sniffio',
+    # Uvicorn and dependencies
+    'uvicorn',
+    'uvicorn.logging',
+    'uvicorn.loops',
+    'uvicorn.loops.auto',
+    'uvicorn.protocols',
+    'uvicorn.protocols.http',
+    'uvicorn.protocols.http.auto',
+    'uvicorn.protocols.http.h11_impl',
+    'uvicorn.protocols.websockets',
+    'uvicorn.protocols.websockets.auto',
+    'uvicorn.protocols.websockets.wsproto_impl',
+    'uvicorn.lifespan',
+    'uvicorn.lifespan.on',
+    'h11',
+    'websockets',
+    'websockets.legacy',
+    'websockets.legacy.server',
+    # Requests (for server sync)
+    'requests',
+    'urllib3',
+    'certifi',
+    'charset_normalizer',
+]
+
+# On Windows, use more aggressive collection for FastAPI packages
+# This fixes import errors on Windows while keeping Linux builds stable
+if is_windows:
+    print("Windows build: Using collect_all for FastAPI packages...")
+    for package in ['fastapi', 'starlette', 'pydantic', 'pydantic_core', 'anyio', 'uvicorn', 'websockets', 'h11']:
+        try:
+            tmp_datas, tmp_binaries, tmp_hiddenimports = collect_all(package)
+            datas += tmp_datas
+            binaries += tmp_binaries
+            hiddenimports += tmp_hiddenimports
+            print(f"  ✓ Collected {package}")
+        except Exception as e:
+            print(f"  ⚠ Warning: Could not collect {package}: {e}")
+
 a = Analysis(
     ['main.py'],
     pathex=[],
-    binaries=[],
+    binaries=binaries,
-    datas=[
+    datas=datas,
-        ('config/default_config.yaml', 'config'),
+    hiddenimports=hiddenimports,
-        (vad_assets_path, 'faster_whisper/assets'),  # Include VAD model
-    ],
-    hiddenimports=[
-        'PySide6.QtCore',
-        'PySide6.QtWidgets',
-        'PySide6.QtGui',
-        'faster_whisper',
-        'faster_whisper.transcribe',
-        'faster_whisper.vad',
-        'ctranslate2',
-        'sounddevice',
-        'noisereduce',
-        'webrtcvad',
-        'scipy',
-        'scipy.signal',
-        'numpy',
-        # FastAPI and dependencies
-        'fastapi',
-        'fastapi.routing',
-        'fastapi.responses',
-        'starlette',
-        'starlette.applications',
-        'starlette.routing',
-        'starlette.responses',
-        'starlette.websockets',
-        'starlette.middleware',
-        'starlette.middleware.cors',
-        'pydantic',
-        'pydantic.fields',
-        'pydantic.main',
-        'anyio',
-        'anyio._backends',
-        'anyio._backends._asyncio',
-        'sniffio',
-        # Uvicorn and dependencies
-        'uvicorn',
-        'uvicorn.logging',
-        'uvicorn.loops',
-        'uvicorn.loops.auto',
-        'uvicorn.protocols',
-        'uvicorn.protocols.http',
-        'uvicorn.protocols.http.auto',
-        'uvicorn.protocols.http.h11_impl',
-        'uvicorn.protocols.websockets',
-        'uvicorn.protocols.websockets.auto',
-        'uvicorn.protocols.websockets.wsproto_impl',
-        'uvicorn.lifespan',
-        'uvicorn.lifespan.on',
-        'h11',
-        'websockets',
-        'websockets.legacy',
-        'websockets.legacy.server',
-        # Requests (for server sync)
-        'requests',
-        'urllib3',
-        'certifi',
-        'charset_normalizer',
-    ],
     hookspath=[],
     hooksconfig={},
     runtime_hooks=[],