Initial portal commit: landing + 9 AI-powered apps

Apps:
- dwg-rooms: extract room numbers from DWG/DXF
- dwg-counting: count symbols in PDF drawings (OpenCV template matching)
- contract-check: review PDF contracts against a checklist (Claude vision + Tesseract OCR fallback)
- email-drafter: bullet notes → polished Czech/English business emails
- invoice-extractor: PDF/image invoice → structured data → Excel
- translator: Czech-first translator across 19 languages with tone control
- vv-check: find inconsistent unit prices across VV sheets in one workbook
- vv-compare: diff original vs new VV files (changes / added / removed)
- feature-request: portal users submit ideas + sample files

Infrastructure:
- LiteLLM gateway with per-app virtual keys + budgets
- Langfuse observability
- Geist font, shared theme, cross-subdomain back link + theme sync via cookie/URL
- Caddy reverse proxy on *.klas.chat

dwg-rooms/Dockerfile

@@ -0,0 +1,38 @@
+# Stage 1: compile LibreDWG (provides dwg2dxf for DWG → DXF conversion)
+FROM debian:bookworm-slim AS libredwg-builder
+
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    xz-utils \
+    build-essential \
+    autoconf \
+    automake \
+    libtool \
+    python3 \
+    && rm -rf /var/lib/apt/lists/*
+
+COPY libredwg-0.12.5.tar.xz .
+RUN tar xf libredwg-0.12.5.tar.xz \
+    && cd libredwg-0.12.5 \
+    && ./configure --prefix=/opt/libredwg --disable-shared --disable-bindings \
+    && make -j"$(nproc)" \
+    && make install \
+    && cd .. \
+    && rm -rf libredwg-0.12.5 libredwg-0.12.5.tar.xz
+
+# Stage 2: runtime
+FROM python:3.12-slim
+
+COPY --from=libredwg-builder /opt/libredwg/bin/dwgread /usr/local/bin/dwgread
+
+WORKDIR /app
+
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+COPY . .
+
+RUN mkdir -p /tmp/dwg-rooms
+
+EXPOSE 8000
+
+CMD ["uvicorn", "main:app", "--host", "0.0.0.0", "--port", "8000"]