feat: initial commit for oil price scraper service

FastAPI-based scraper for commodity ticker prices (HO, CL, RB futures)
and competitor oil pricing from NewEnglandOil. Includes cron-driven
scraping, PostgreSQL storage, and REST endpoints for price retrieval.

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

app/newenglandoil/schemas.py

@@ -0,0 +1,12 @@
+from typing import List
+from pydantic import BaseModel
+from app.schemas import PriceRecord
+
+class LatestPriceResponse(BaseModel):
+    """Latest price scrape response schema."""
+    status: str
+    message: str
+    prices_scraped: int
+    prices_stored: int
+    scrape_timestamp: str
+    prices: List[PriceRecord]