feat: auto-detect language and prefer gpu for windows asr

tests/test_windows_asr_http.py

@@ -0,0 +1,71 @@
+from __future__ import annotations
+
+import importlib.util
+import os
+import unittest
+from pathlib import Path
+
+from fastapi.testclient import TestClient
+
+
+ROOT = Path(__file__).resolve().parents[1]
+APP_PATH = ROOT / "deploy" / "storyforge-windows-asr-http" / "app.py"
+
+
+def load_windows_asr_app():
+    spec = importlib.util.spec_from_file_location("storyforge_windows_asr_app", APP_PATH)
+    module = importlib.util.module_from_spec(spec)
+    assert spec and spec.loader
+    spec.loader.exec_module(module)
+    return module
+
+
+class WindowsAsrHttpTests(unittest.TestCase):
+    def setUp(self) -> None:
+        self._saved = {key: os.environ.get(key) for key in [
+            "WHISPER_LANGUAGE",
+            "WHISPER_DEVICE",
+            "WHISPER_COMPUTE_TYPE",
+        ]}
+
+    def tearDown(self) -> None:
+        for key, value in self._saved.items():
+            if value is None:
+                os.environ.pop(key, None)
+            else:
+                os.environ[key] = value
+
+    def test_defaults_prefer_auto_language_and_gpu_first_profiles(self) -> None:
+        os.environ.pop("WHISPER_LANGUAGE", None)
+        os.environ.pop("WHISPER_DEVICE", None)
+        os.environ.pop("WHISPER_COMPUTE_TYPE", None)
+
+        module = load_windows_asr_app()
+
+        self.assertIsNone(module.resolve_language())
+        self.assertEqual(module.describe_language_mode(), "auto")
+        self.assertEqual(
+            module.build_runtime_profiles(),
+            [("cuda", "int8_float16"), ("cpu", "int8")],
+        )
+
+        client = TestClient(module.app)
+        try:
+            payload = client.get("/health").json()
+        finally:
+            client.close()
+
+        self.assertEqual(payload["language"], "auto")
+        self.assertEqual(payload["device"], "auto")
+        self.assertEqual(payload["compute_type"], "auto")
+
+    def test_explicit_runtime_overrides_are_respected(self) -> None:
+        os.environ["WHISPER_LANGUAGE"] = "zh"
+        os.environ["WHISPER_DEVICE"] = "cpu"
+        os.environ["WHISPER_COMPUTE_TYPE"] = "int8"
+
+        module = load_windows_asr_app()
+
+        self.assertEqual(module.resolve_language(), "zh")
+        self.assertEqual(module.describe_language_mode(), "zh")
+        self.assertEqual(module.build_runtime_profiles(), [("cpu", "int8")])