feat(media): Add HEIC/HEIF image support - v1.4.2

- Add pillow-heif dependency for iPhone photo support
- Auto-convert HEIC to JPEG (browsers can't display HEIC)
- Graceful error if pillow-heif not installed
- Handles RGBA/P mode conversion to RGB

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

requirements.txt

@@ -31,5 +31,8 @@ pytest==8.0.*
 # System Monitoring (v1.1.2)
 psutil==5.9.*
 
-# Image Processing (v1.2.0)
-Pillow==10.0.*
+# Image Processing (v1.2.0, updated v1.4.2 for HEIC support)
+Pillow==10.1.*
+
+# HEIC/HEIF Support (v1.4.2 - iPhone photos)
+pillow-heif==0.18.*