feat: initial BantayCam scaffold

- FastAPI backend with async SQLAlchemy
- Camera RTSP management (add, start, stop)
- Vehicle detection (YOLO + fast-alpr)
  - Type: car, motorcycle, truck, jeepney
  - Color detection (HSV)
  - License plate OCR
  - Motorcycle person count
- Face detection + InsightFace ArcFace embedding
- pgvector identity grouping (auto-cluster same face)
- Vehicle + person movement trail APIs
- Docker Compose with pgvector/pg16
- Models: Camera, VehicleIdentity, VehicleEvent, PersonIdentity, FaceEvent

backend/app/models/camera.py

@@ -0,0 +1,30 @@
+from sqlalchemy import Column, String, Boolean, DateTime, Text, Enum
+from sqlalchemy.dialects.postgresql import UUID
+from sqlalchemy.sql import func
+import uuid
+import enum
+
+from app.core.database import Base
+
+
+class CameraStatus(str, enum.Enum):
+    active = "active"
+    inactive = "inactive"
+    error = "error"
+
+
+class Camera(Base):
+    __tablename__ = "cameras"
+
+    id = Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
+    name = Column(String(255), nullable=False, unique=True)           # e.g. "Gate 1 - Main Entrance"
+    rtsp_url = Column(Text, nullable=False)                           # rtsp://admin:pass@192.168.1.64:554/...
+    location = Column(String(255), nullable=True)                     # e.g. "North Gate, Building A"
+    description = Column(Text, nullable=True)
+    status = Column(Enum(CameraStatus), default=CameraStatus.inactive)
+    is_enabled = Column(Boolean, default=True)
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+    updated_at = Column(DateTime(timezone=True), onupdate=func.now())
+
+    def __repr__(self):
+        return f"<Camera {self.name} ({self.status})>"