Add BeanFlows MVP: coffee analytics dashboard, API, and web app

- Fix pipeline granularity: add market_year to cleaned/serving SQL models
- Add DuckDB data access layer with async query functions (analytics.py)
- Build Chart.js dashboard: supply/demand, STU ratio, top producers, YoY table
- Add country comparison page with multi-select picker
- Replace items CRUD with read-only commodity API (list, metrics, countries, CSV)
- Configure BeanFlows plan tiers (Free/Starter/Pro) with feature gating
- Rewrite public pages for coffee market intelligence positioning
- Remove boilerplate items schema, update health check for DuckDB
- Add test suite: 139 tests passing (dashboard, API, billing)

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

web/Dockerfile

@@ -0,0 +1,22 @@
+# Build stage
+FROM python:3.12-slim AS build
+COPY --from=ghcr.io/astral-sh/uv:0.8 /uv /uvx /bin/
+WORKDIR /app
+ENV UV_COMPILE_BYTECODE=1 UV_LINK_MODE=copy
+COPY uv.lock pyproject.toml README.md ./
+COPY src/ ./src/
+RUN --mount=type=cache,target=/root/.cache/uv \
+    uv sync --no-dev --frozen
+
+# Runtime stage
+FROM python:3.12-slim AS runtime
+ENV PATH="/app/.venv/bin:$PATH"
+RUN useradd -m -u 1000 appuser
+WORKDIR /app
+RUN mkdir -p /app/data && chown -R appuser:appuser /app
+COPY --from=build --chown=appuser:appuser /app .
+USER appuser
+ENV PYTHONUNBUFFERED=1
+ENV DATABASE_PATH=/app/data/app.db
+EXPOSE 5000
+CMD ["hypercorn", "beanflows.app:app", "--bind", "0.0.0.0:5000", "--workers", "1"]