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/pytest.ini

@@ -0,0 +1,16 @@
+[pytest]
+testpaths = tests
+
+# Warnings are errors. A DeprecationWarning is a change that will break the
+# build later, and the only reliable time to deal with one is when it first
+# appears - once a few are tolerated, the new one is invisible in the noise.
+#
+# When a dependency starts warning about something you cannot fix yet, add a
+# narrow ignore here rather than relaxing this line, e.g.:
+#
+#   ignore:some message regex:DeprecationWarning:the_package.*
+#
+# Keep each ignore as specific as the warning it silences, so it stops applying
+# once the dependency is fixed.
+filterwarnings =
+    error