Add Other Purchases to budget page

- New other_purchases table (date, total, notes)
- /api/other CRUD endpoints
- Budget stats now include other costs in cost/egg and cost/dozen math
- Budget page: new Log Other Purchases form, stat cards for other costs,
  combined Purchase History table showing feed and other entries together

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/routers/other.py

@@ -0,0 +1,59 @@
+from datetime import date
+from typing import Optional
+from fastapi import APIRouter, Depends, HTTPException
+from sqlalchemy import select
+from sqlalchemy.orm import Session
+
+from database import get_db
+from models import OtherPurchase
+from schemas import OtherPurchaseCreate, OtherPurchaseUpdate, OtherPurchaseOut
+
+router = APIRouter(prefix="/api/other", tags=["other"])
+
+
+@router.get("", response_model=list[OtherPurchaseOut])
+def list_other_purchases(
+    start: Optional[date] = None,
+    end:   Optional[date] = None,
+    db:    Session = Depends(get_db),
+):
+    q = select(OtherPurchase).order_by(OtherPurchase.date.desc())
+    if start:
+        q = q.where(OtherPurchase.date >= start)
+    if end:
+        q = q.where(OtherPurchase.date <= end)
+    return db.scalars(q).all()
+
+
+@router.post("", response_model=OtherPurchaseOut, status_code=201)
+def create_other_purchase(body: OtherPurchaseCreate, db: Session = Depends(get_db)):
+    record = OtherPurchase(**body.model_dump())
+    db.add(record)
+    db.commit()
+    db.refresh(record)
+    return record
+
+
+@router.put("/{record_id}", response_model=OtherPurchaseOut)
+def update_other_purchase(
+    record_id: int,
+    body: OtherPurchaseUpdate,
+    db: Session = Depends(get_db),
+):
+    record = db.get(OtherPurchase, record_id)
+    if not record:
+        raise HTTPException(status_code=404, detail="Record not found")
+    for field, value in body.model_dump(exclude_none=True).items():
+        setattr(record, field, value)
+    db.commit()
+    db.refresh(record)
+    return record
+
+
+@router.delete("/{record_id}", status_code=204)
+def delete_other_purchase(record_id: int, db: Session = Depends(get_db)):
+    record = db.get(OtherPurchase, record_id)
+    if not record:
+        raise HTTPException(status_code=404, detail="Record not found")
+    db.delete(record)
+    db.commit()