feat: 重构接口日志页面与接口监控看板，支持HTTP方法过滤和实时轮询

backend/app/models/__init__.py

@@ -1 +1,2 @@
 # models package
+from app.models.external_api_log import ExternalApiLog

backend/app/models/external_api_log.py

@@ -0,0 +1,28 @@
+from datetime import datetime, timezone
+from typing import Optional
+from sqlalchemy import Index, Integer, String, DateTime, Boolean, text
+from sqlalchemy.orm import mapped_column, Mapped
+from app.database import Base
+
+
+class ExternalApiLog(Base):
+    __tablename__ = "external_api_logs"
+
+    id: Mapped[int] = mapped_column(Integer, primary_key=True, index=True)
+    direction: Mapped[str] = mapped_column(String(32), index=True)  # "upstream" | "website"
+    target_type: Mapped[str] = mapped_column(String(32), index=True)  # "upstream" | "website"
+    target_id: Mapped[Optional[int]] = mapped_column(Integer, nullable=True, index=True)
+    target_name: Mapped[Optional[str]] = mapped_column(String(255), nullable=True)
+    method: Mapped[str] = mapped_column(String(16))
+    path: Mapped[str] = mapped_column(String(1024))
+    url_host: Mapped[str] = mapped_column(String(255))
+    status_code: Mapped[Optional[int]] = mapped_column(Integer, nullable=True, index=True)
+    success: Mapped[bool] = mapped_column(Boolean, default=True, index=True)
+    duration_ms: Mapped[int] = mapped_column(Integer)
+    error_type: Mapped[Optional[str]] = mapped_column(String(255), nullable=True)
+    error_message: Mapped[Optional[str]] = mapped_column(String(1024), nullable=True)
+    created_at: Mapped[datetime] = mapped_column(DateTime, default=lambda: datetime.now(timezone.utc), index=True)
+
+    __table_args__ = (
+        Index("ix_external_api_logs_created_at_desc", text("created_at DESC")),
+    )