fix(edge-test): drop uvicorn[standard] to keep zero-native-build promise

uvicorn[standard] pulls in uvloop, httptools, watchfiles — Cython/C
extensions. README claims "네이티브 빌드 0" and the whole point of
edge-test is to avoid wheel build failures, so plain uvicorn matches
the stated invariant.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

edge-test/requirements.txt

@@ -1,5 +1,7 @@
 # 순수 Python 패키지만. 네이티브 빌드 의존성 없음.
+# (uvicorn[standard] 는 uvloop/httptools/watchfiles 같은 C 확장을 끌고
+#  오므로 의도적으로 plain uvicorn 만 사용.)
 edge-tts>=6.1.0
 fastapi>=0.110
-uvicorn[standard]>=0.27
+uvicorn>=0.27
 pydantic>=2.0