feat: add report export capabilities with Pandoc and WeasyPrint support

- Updated Dockerfiles to include Pandoc and WeasyPrint runtime libraries for report generation.
- Enhanced report retrieval functionality to include version siblings in the response.
- Modified report export process to utilize WeasyPrint for PDF generation, improving output quality.

Dockerfile.allinone

@@ -121,6 +121,13 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
     libgbm1 \
     libcairo2 \
     libpango-1.0-0 \
+    # ============================
+    # Report export (Pandoc + WeasyPrint runtime libs)
+    # ============================
+    pandoc \
+    libpangoft2-1.0-0 \
+    libharfbuzz0b \
+    libharfbuzz-subset0 \
     && rm -rf /var/lib/apt/lists/*
 
 # Install Node.js 20.x (for running frontend)