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

.env.example

@@ -0,0 +1,23 @@
+# BantayCam Environment Variables
+# Copy to .env and fill in your values
+
+# Database
+DATABASE_URL=postgresql+asyncpg://bantaycam:bantaycam@localhost:5432/bantaycam
+
+# Storage
+STORAGE_TYPE=local
+STORAGE_PATH=./snapshots
+
+# AI Models
+YOLO_MODEL=yolov8n.pt
+FACE_MODEL=buffalo_l
+GPU_DEVICE=0              # Set to -1 for CPU-only
+
+# Processing tuning
+PROCESS_EVERY_N_FRAMES=5
+FACE_SIMILARITY_THRESHOLD=0.5
+PLATE_CONFIDENCE_THRESHOLD=0.6
+
+# Alerts (optional)
+TELEGRAM_BOT_TOKEN=
+TELEGRAM_CHAT_ID=