Feat/implement cv pdf download#171
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Add GET /cv/download endpoint that generates and streams the CV as PDF. Includes IPDFService interface, WeasyPrintPDFService with Jinja2 template, asyncio.to_thread for non-blocking generation, and updated Dockerfile/ requirements with WeasyPrint system and Python dependencies.
WeasyPrint requires libgobject-2.0-0 (provided by libglib2.0-0) at import time. Added to both production Dockerfile and Dockerfile.dev.
Packages libglib2.0-0, libpango-1.0-0, libpangocairo-1.0-0 and libgdk-pixbuf2.0-0 were renamed with t64 suffix in Bookworm as part of the 64-bit time_t transition.
Two-column layout with sidebar (contact, networks, skills, tools, certifications) and main area (header, bio, experience, education, projects, training). Uses frontend color palette and xhtml2pdf-compatible CSS (tables instead of flexbox/grid, no CSS variables).
xhtml2pdf pulls in svglib → rlpycairo → pycairo, which requires the libcairo2-dev system library to compile at pip install time. CI runners lacked that dependency, breaking every pipeline run. WeasyPrint ≥ v53 ships a pure-Python wheel (pydyf renderer), so pip install succeeds without any C compilation. Its runtime system deps (Pango, HarfBuzz, GDK-Pixbuf) are added to both Dockerfiles and to all three CI jobs. The service implementation is simplified to a single HTML(string=...).write_pdf() call, matching the file and class name that was already declared as the intended library.
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