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/requirements-dev.txt

@@ -0,0 +1,14 @@
+# Test-only dependencies, kept out of requirements.txt so the Docker image does
+# not ship them - the container has no tests/ directory to run anyway (the
+# Dockerfile copies app/, cli/, scripts/, data/ and serve.py, nothing else).
+#
+# For development, install both files:
+#     pip install -r requirements.txt -r requirements-dev.txt
+
+pytest>=8.3.3
+
+# Starlette's TestClient deprecates the httpx 0.x backend and emits a
+# StarletteDeprecationWarning without this. pytest.ini turns warnings into
+# errors, so it is a hard requirement of the suite, not a nicety. Test-only:
+# the application itself uses the `httpx` pinned in requirements.txt.
+httpx2>=2.10.0