Revert PDF generation; simplify to DOCX + MD + JSON only

- Remove PDF helpers, LibreOffice, PyPDF2, reportlab
- Transcript DOCX: standalone, no cover page, with line numbering
- Summary DOCX: standalone, no cover page, no line numbering
- Attachments:
  - Transcribe: JSON, transcript MD, transcript DOCX
  - Transcribe & Summarize: JSON, transcript MD, transcript DOCX, summary MD, summary DOCX

Dockerfile

@@ -9,14 +9,9 @@ LABEL description="Scraibe: LocalAI-backed transcription and diarization client
                     Sends audio to a LocalAI server running vibevoice.cpp and uses a second LLM for summarization."
 LABEL url="https://git.optimex.systems/admin/scribe"
 
-# Install system dependencies (ffmpeg, redis, LibreOffice for PDF generation)
+# Install system dependencies (ffmpeg, redis)
 RUN apt update -y && \
-    apt install -y --no-install-recommends \
-        ffmpeg \
-        redis-server \
-        libreoffice-writer \
-        fonts-dejavu-core \
-        && \
+    apt install -y --no-install-recommends ffmpeg redis-server && \
     apt clean && \
     rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*