Add Polaris FastAPI backend: models/schemas, pricing+scoring+order router, importer, Celery tasks, API routers, seed script

backend/app/routers/customers.py

@@ -0,0 +1,42 @@
+"""Customers router.
+
+GET  /api/customers
+GET  /api/customers/{id}
+POST /api/customers
+"""
+from typing import List
+
+from fastapi import APIRouter, Depends, HTTPException
+from sqlalchemy.orm import Session
+
+from app.database import get_db
+from app.models import Customer
+from app.schemas import CustomerOut, CustomerRegister
+
+router = APIRouter()
+
+
+@router.get("", response_model=List[CustomerOut])
+def list_customers(db: Session = Depends(get_db)):
+    return db.query(Customer).order_by(Customer.created_at.desc()).all()
+
+
+@router.get("/{customer_id}", response_model=CustomerOut)
+def get_customer(customer_id, db: Session = Depends(get_db)):
+    customer = db.query(Customer).filter(Customer.id == customer_id).first()
+    if customer is None:
+        raise HTTPException(status_code=404, detail="customer not found")
+    return customer
+
+
+@router.post("", response_model=CustomerOut)
+def create_customer(body: CustomerRegister, db: Session = Depends(get_db)):
+    email = body.email.strip().lower()
+    existing = db.query(Customer).filter(Customer.email == email).first()
+    if existing is not None:
+        raise HTTPException(status_code=409, detail="email already registered")
+    customer = Customer(email=email, name=body.name, shipping_addr=body.shipping_addr or {})
+    db.add(customer)
+    db.commit()
+    db.refresh(customer)
+    return customer