chore: configure Git LFS and reorganize demo files

- Add .gitattributes with LFS tracking for Office docs, PDF, EPUB, and
  large images in apps/playground/public/demo/
- Ignore generated demos.generated.ts in .gitignore
- Move demo files from upload/ to apps/playground/public/demo/
- Replace outdated demo samples (RTF, DOCX, XLSX) with new real-world
  files (PDF, PPTX, XLSX, images)
- Delete legacy demo files that are no longer representative

.gitattributes

@@ -0,0 +1,29 @@
+# Git LFS — track large binary demo / preview assets so the repo stays slim.
+# Run `git lfs install` once per clone before pulling.
+
+# Office documents
+*.pptx filter=lfs diff=lfs merge=lfs -text
+*.ppt  filter=lfs diff=lfs merge=lfs -text
+*.xlsx filter=lfs diff=lfs merge=lfs -text
+*.xls  filter=lfs diff=lfs merge=lfs -text
+*.docx filter=lfs diff=lfs merge=lfs -text
+*.doc  filter=lfs diff=lfs merge=lfs -text
+
+# Books / publishing
+*.pdf  filter=lfs diff=lfs merge=lfs -text
+*.epub filter=lfs diff=lfs merge=lfs -text
+
+# Media (uncomment if/when added to demos)
+# *.mp4  filter=lfs diff=lfs merge=lfs -text
+# *.webm filter=lfs diff=lfs merge=lfs -text
+# *.mov  filter=lfs diff=lfs merge=lfs -text
+# *.mp3  filter=lfs diff=lfs merge=lfs -text
+# *.wav  filter=lfs diff=lfs merge=lfs -text
+
+# Big images (small icons stay regular git)
+# Tracked under public/demo/ only — keeps logo.svg etc. out of LFS.
+apps/playground/public/demo/*.png filter=lfs diff=lfs merge=lfs -text
+apps/playground/public/demo/*.jpg filter=lfs diff=lfs merge=lfs -text
+apps/playground/public/demo/*.jpeg filter=lfs diff=lfs merge=lfs -text
+apps/playground/public/demo/*.gif filter=lfs diff=lfs merge=lfs -text
+apps/playground/public/demo/*.webp filter=lfs diff=lfs merge=lfs -text

.gitignore

@@ -26,6 +26,9 @@ apps/*/build
 # package builds
 packages/*/dist/
 
+# generated demo manifest (regenerated by scripts/sync-demos.mjs)
+apps/playground/src/lib/demos.generated.ts
+
 # misc
 .DS_Store
 *.pem

apps/playground/public/demo/SQ-PD-FAQ-063.rtf

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