Initial commit: ASR v2 with multi-venv isolation

- faster-whisper, Qwen3-ASR, gateway 각 컴포넌트별 Python venv 분리
- 기본언어 한국어(ko)
- 처리내역 탭: 목록/상세/원본파일 재생/삭제
- 백엔드별 동적 모델 드랍다운
- /history, /uploads API 추가
- 기존 인스턴스(port 18100) 보존, 신규 port 18101

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

app/common.py

@@ -0,0 +1,65 @@
+from __future__ import annotations
+
+import os
+from pathlib import Path
+from typing import Optional
+
+
+def env_str(name: str, default: str = "") -> str:
+    return os.getenv(name, default)
+
+
+def env_int(name: str, default: int) -> int:
+    raw = os.getenv(name)
+    if raw is None or raw == "":
+        return default
+    return int(raw)
+
+
+def env_float(name: str, default: float) -> float:
+    raw = os.getenv(name)
+    if raw is None or raw == "":
+        return default
+    return float(raw)
+
+
+def env_bool(name: str, default: bool = False) -> bool:
+    raw = os.getenv(name)
+    if raw is None:
+        return default
+    return raw.strip().lower() in {"1", "true", "yes", "on"}
+
+
+ASR_BASE_DIR = Path(env_str("ASR_BASE_DIR", "/srv/asr"))
+MODEL_CACHE = Path(env_str("WHISPER_CACHE_DIR", str(ASR_BASE_DIR / "models-cache")))
+UPLOAD_DIR = ASR_BASE_DIR / "uploads"
+RESULT_DIR = ASR_BASE_DIR / "results"
+CUSTOM_MODEL_DIR = ASR_BASE_DIR / "custom-models"
+
+DEVICE = env_str("ASR_DEVICE", "cuda")
+COMPUTE_TYPE = env_str("ASR_COMPUTE_TYPE", "float16")
+DEFAULT_BACKEND = env_str("DEFAULT_BACKEND", "faster-whisper")
+DEFAULT_MODEL = env_str("DEFAULT_MODEL", "large-v3")
+DEFAULT_LANGUAGE = env_str("DEFAULT_LANGUAGE", "ko")
+
+FASTER_WHISPER_URL = env_str("FASTER_WHISPER_URL", "http://127.0.0.1:8001")
+QWEN3_URL = env_str("QWEN3_URL", "http://127.0.0.1:8004")
+
+PYANNOTE_HF_TOKEN = env_str("PYANNOTE_HF_TOKEN", "")
+
+
+def ensure_runtime_dirs() -> None:
+    for p in [ASR_BASE_DIR, MODEL_CACHE, UPLOAD_DIR, RESULT_DIR, CUSTOM_MODEL_DIR]:
+        p.mkdir(parents=True, exist_ok=True)
+
+
+def resolve_custom_model_path(custom_model_path: Optional[str]) -> Optional[str]:
+    if not custom_model_path:
+        return None
+    raw = custom_model_path.strip()
+    if not raw:
+        return None
+    candidate = Path(raw)
+    if candidate.is_absolute():
+        return str(candidate)
+    return str((CUSTOM_MODEL_DIR / candidate).resolve())