Rename project from asr-v2 to speech

The project now covers both ASR and TTS, so "asr-v2" no longer fits.
Renames: quadlet (asr-v2.container -> speech.container, container
name, image tag), build.sh, FastAPI/UI title, and the OIDC env var
prefix (ASR_V2_* -> SPEECH_*, matching the renamed Authentik
provider/application slug "speech"). Internal Python packages
(asr/, tts/, core/) were already named generically and don't change.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

build.sh

@@ -1,7 +1,7 @@
 #!/usr/bin/env bash
 set -euo pipefail
 
-IMAGE="localhost/asr-v2:latest"
+IMAGE="localhost/speech:latest"
 
 echo "==> Building $IMAGE"
 podman build -t "$IMAGE" -f Containerfile .
@@ -11,9 +11,9 @@ echo "빌드 완료: $IMAGE"
 echo ""
 echo "배포 방법:"
 echo "  1. quadlet 파일 복사:"
-echo "     cp quadlet/asr-v2.container /etc/containers/systemd/"
+echo "     cp quadlet/speech.container /etc/containers/systemd/"
 echo "  2. systemd 리로드 및 시작:"
 echo "     systemctl daemon-reload"
-echo "     systemctl start asr-v2"
+echo "     systemctl start speech"
 echo "  3. 로그 확인:"
-echo "     journalctl -u asr-v2 -f"
+echo "     journalctl -u speech -f"