chore: Add .gitignore file

Add comprehensive .gitignore for Rust project including:
- Rust build artifacts (target/, Cargo.lock)
- IDE files (.vscode/, .idea/, etc.)
- OS files (.DS_Store, Thumbs.db, etc.)
- Database and log files
- Claude Code configuration

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

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

Author: unhappychoice

.gitignore

@@ -0,0 +1,34 @@
+# Rust
+/target/
+Cargo.lock
+
+# IDE
+.vscode/
+.idea/
+*.swp
+*.swo
+*~
+
+# OS
+.DS_Store
+.DS_Store?
+._*
+.Spotlight-V100
+.Trashes
+ehthumbs.db
+Thumbs.db
+
+# Logs
+*.log
+
+# Database
+*.db
+*.sqlite
+*.sqlite3
+
+# Backup files
+*.bak
+*.tmp
+
+# Claude Code
+.claude/