Electronics Catalog: API, MCP server, frontend and deployment

Verified catalogue of mobiles and laptops sold in India, collected from
real retail listings (FastAPI backend, React frontend, Postgres/pgvector).

- REST API under /api/elec (read-only catalogue; admin endpoints need login)
- MCP server (FastMCP) at /mcp/ with list_categories, search_products,
  get_product and price_history tools
- Real ratings and reviews read from product pages and search results
- Production Dockerfile (requirements-api.txt, no PyTorch) and
  .env.production.example; remote database only via an explicit
  ELEC_ALLOW_REMOTE_DB host/name allowlist
- docs/API.md: endpoint and MCP reference with live examples

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

backend/data_diag_laptops.py

@@ -0,0 +1,26 @@
+"""Diagnostic: laptop products, their sites, and listings left unlinked."""
+from app.electronics.db.connection import connect
+
+with connect() as c:
+    rows = c.execute(
+        """
+        SELECT p.variant_key, p.verification_status AS v, string_agg(s.name, ', ') AS sites
+        FROM elec.product p
+        JOIN elec.category ca ON ca.id = p.category_id AND ca.slug = 'laptops'
+        LEFT JOIN elec.product_listing_map m ON m.product_id = p.id
+        LEFT JOIN elec.source_listing l ON l.id = m.listing_id
+        LEFT JOIN elec.site s ON s.id = l.site_id
+        GROUP BY 1, 2 ORDER BY 1
+        """
+    ).fetchall()
+    for r in rows:
+        print(f"{r['v'][:5]:5} {r['variant_key']:60} | {r['sites']}")
+    print("\nUnlinked:")
+    for r in c.execute(
+        """
+        SELECT s.name, l.title FROM elec.source_listing l JOIN elec.site s ON s.id = l.site_id
+        JOIN elec.category ca ON ca.id = l.category_id AND ca.slug = 'laptops'
+        WHERE NOT EXISTS (SELECT 1 FROM elec.product_listing_map m WHERE m.listing_id = l.id)
+        """
+    ):
+        print(f"  {r['name'][:12]:12} {r['title'][:120]}".encode("ascii", "replace").decode())