Fix datetime deprecation warnings in Phase 8 modules

- Update all datetime.utcnow() to datetime.now(UTC) for Python 3.12+ compatibility
- Update all datetime.utcfromtimestamp() to datetime.fromtimestamp(..., UTC)
- Fix dataclass default_factory to use lambda: datetime.now(UTC)
- Update auth, audit, billing, and realtime modules
- Add UTC import from datetime module
- Update pytest configuration to include pytest-asyncio
- All 28 Phase 8 enterprise tests pass with no warnings

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

ontology_platform/ont_platform/auth/models.py

@@ -0,0 +1,158 @@
+"""인증 모델 (Organization, User, APIKey).
+
+Phase 8: 멀티테넌트 지원
+"""
+
+from dataclasses import dataclass, field
+from datetime import datetime, UTC
+from typing import Optional, List
+import uuid
+
+
+@dataclass
+class Organization:
+    """조직 (테넌트)."""
+
+    id: str = field(default_factory=lambda: str(uuid.uuid4()))
+    name: str = ""
+    created_at: datetime = field(default_factory=lambda: datetime.now(UTC))
+    updated_at: datetime = field(default_factory=lambda: datetime.now(UTC))
+    is_active: bool = True
+    subscription_tier: str = "free"  # "free", "pro", "enterprise"
+    max_users: int = 5  # Free tier 기본값
+    storage_limit_gb: int = 1
+    api_quota_monthly: int = 10000
+    metadata: dict = field(default_factory=dict)
+
+    def to_dict(self) -> dict:
+        """딕셔너리로 변환."""
+        return {
+            "id": self.id,
+            "name": self.name,
+            "created_at": self.created_at.isoformat(),
+            "is_active": self.is_active,
+            "subscription_tier": self.subscription_tier,
+            "max_users": self.max_users,
+            "storage_limit_gb": self.storage_limit_gb,
+            "api_quota_monthly": self.api_quota_monthly,
+        }
+
+
+@dataclass
+class User:
+    """사용자."""
+
+    id: str = field(default_factory=lambda: str(uuid.uuid4()))
+    org_id: str = ""  # 조직 ID (FK)
+    email: str = ""
+    username: str = ""
+    hashed_password: str = ""
+    role: str = "viewer"  # "admin", "editor", "viewer"
+    is_active: bool = True
+    created_at: datetime = field(default_factory=lambda: datetime.now(UTC))
+    updated_at: datetime = field(default_factory=lambda: datetime.now(UTC))
+    last_login: Optional[datetime] = None
+    metadata: dict = field(default_factory=dict)
+
+    def to_dict(self) -> dict:
+        """딕셔너리로 변환."""
+        return {
+            "id": self.id,
+            "org_id": self.org_id,
+            "email": self.email,
+            "username": self.username,
+            "role": self.role,
+            "is_active": self.is_active,
+            "created_at": self.created_at.isoformat(),
+            "last_login": self.last_login.isoformat() if self.last_login else None,
+        }
+
+
+@dataclass
+class APIKey:
+    """API 키."""
+
+    id: str = field(default_factory=lambda: str(uuid.uuid4()))
+    org_id: str = ""  # 조직 ID (FK)
+    key_hash: str = ""  # SHA256 해시 (원본은 저장하지 않음)
+    name: str = ""
+    description: str = ""
+    is_active: bool = True
+    created_at: datetime = field(default_factory=lambda: datetime.now(UTC))
+    last_used: Optional[datetime] = None
+    last_used_ip: Optional[str] = None
+    metadata: dict = field(default_factory=dict)
+
+    def to_dict(self) -> dict:
+        """딕셔너리로 변환 (해시만 포함)."""
+        return {
+            "id": self.id,
+            "org_id": self.org_id,
+            "name": self.name,
+            "description": self.description,
+            "is_active": self.is_active,
+            "created_at": self.created_at.isoformat(),
+            "last_used": self.last_used.isoformat() if self.last_used else None,
+        }
+
+
+@dataclass
+class TokenPayload:
+    """JWT 토큰 페이로드."""
+
+    user_id: str
+    org_id: str
+    email: str
+    role: str
+    exp: int  # Unix timestamp
+
+    def to_dict(self) -> dict:
+        """딕셔너리로 변환."""
+        return {
+            "user_id": self.user_id,
+            "org_id": self.org_id,
+            "email": self.email,
+            "role": self.role,
+            "exp": self.exp,
+        }
+
+
+@dataclass
+class AuthCredentials:
+    """인증 자격증명."""
+
+    email: Optional[str] = None
+    password: Optional[str] = None
+    api_key: Optional[str] = None
+    token: Optional[str] = None
+
+
+@dataclass
+class CurrentUser:
+    """현재 인증된 사용자."""
+
+    user_id: str
+    org_id: str
+    email: str
+    username: str
+    role: str
+    is_active: bool
+
+    def has_permission(self, action: str) -> bool:
+        """사용자가 작업 권한을 가지고 있는지 확인."""
+        from ont_platform.auth.rbac import RBAC
+
+        rbac = RBAC()
+        permissions = rbac.get_permissions(self.role)
+        return action in permissions
+
+    def to_dict(self) -> dict:
+        """딕셔너리로 변환."""
+        return {
+            "user_id": self.user_id,
+            "org_id": self.org_id,
+            "email": self.email,
+            "username": self.username,
+            "role": self.role,
+            "is_active": self.is_active,
+        }