chore: add demo_docs/ and .claude/settings.local.json to gitignore

Exclude demo documentation directory and Claude Code local settings from version control.

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

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

.gitignore

@@ -38,6 +38,7 @@ env/
 *.swo
 *~
 .DS_Store
+.claude/settings.local.json
 
 # ===== Environment Variables =====
 .env.local
@@ -51,6 +52,7 @@ logs/
 uploads/
 storage/
 temp/
+demo_docs/
 
 # ===== Models =====
 models/paddleocr/*