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/schemas.py

@@ -0,0 +1,16 @@
+from typing import Optional
+from pydantic import BaseModel
+
+class HealthResponse(BaseModel):
+    """Health check response schema."""
+    status: str
+    db_connected: bool
+
+
+class PriceRecord(BaseModel):
+    """Single price record schema."""
+    company_name: str
+    town: Optional[str] = None
+    price_decimal: float
+    scrape_date: str
+    zone: str