Server-side PPTX shift: Docs updated (README, copilot instructions) to reflect PDF-only workflow; legacy LibreOffice paths marked optional.

Setup improvements: Added pi-setup.sh (clone-before-venv, requirements-based install) + HDMI-CEC cec-utils inclusion.
Dependencies: Corrected python-dotenv, added server-side rendering + CEC notes in requirements.txt.
CEC integration: Confirmed and documented usage; minor wording adjustments.

README.md

@@ -4,7 +4,7 @@ Digital signage system for Raspberry Pi that displays presentations, videos, and
 
 ## 🎯 Key Features
 
-- **Automatic Presentation Display** - PPTX files converted to PDF and displayed with Impressive
+- **Automatic Presentation Display** - Server renders PPTX to PDF; client displays PDFs with Impressive
 - **Auto-Advance Slideshows** - Configurable timing for automatic slide progression
 - **Loop Mode** - Presentations can loop infinitely or quit after last slide
 - **HDMI-CEC TV Control** - Automatic TV power on/off based on event scheduling
@@ -25,8 +25,8 @@ Digital signage system for Raspberry Pi that displays presentations, videos, and
 ### Software
 - Raspberry Pi OS (Bookworm or newer)
 - Python 3.x
-- LibreOffice (for PPTX→PDF conversion)
 - Impressive (PDF presenter with auto-advance)
+- (Optional legacy) LibreOffice ONLY if older workflow still sends raw PPTX; otherwise not required
 - Chromium browser (for web content)
 - VLC or MPV (for video playback)
 - CEC Utils (for HDMI-CEC TV control - optional)
@@ -116,7 +116,7 @@ Or use the startup script:
 
 The system uses **Impressive** as the PDF presenter with native auto-advance and loop support:
 
-1. **PPTX files** are automatically converted to PDF using LibreOffice headless
+1. **PPTX files** are converted to PDF server-side (client receives ready-made PDFs)
 2. **PDF files** are displayed directly with Impressive
 3. **Auto-advance** uses Impressive's built-in `--auto` parameter
 4. **Loop mode** uses Impressive's `--wrap` parameter (infinite loop)
@@ -362,10 +362,10 @@ which impressive
 # If not found: sudo apt-get install impressive
 ```
 
-**Check LibreOffice installation:**
+**Legacy LibreOffice (only if still receiving raw PPTX):**
 ```bash
 which libreoffice
-# If not found: sudo apt-get install libreoffice
+# Optional install (legacy only): sudo apt-get install libreoffice
 ```
 
 **Check logs:**
@@ -373,9 +373,8 @@ which libreoffice
 tail -f logs/display_manager.log
 ```
 
-### Presentations don't convert from PPTX
-
-**Verify LibreOffice headless:**
+### Legacy PPTX Conversion (Deprecated)
+Server performs all PPTX→PDF rendering. Use these commands only if supporting an older workflow still sending PPTX:
 ```bash
 libreoffice --headless --convert-to pdf --outdir /tmp presentation.pptx
 ls -l /tmp/*.pdf