chore: Clean up unused files and add .claude settings to gitignore

- Add .claude/settings.local.json to gitignore (user-specific settings)
- Remove unused history.txt (SurrealDB query history)
- Remove unused .env.test.example (testing template no longer used)

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

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

.gitignore

@@ -42,3 +42,6 @@ next-env.d.ts
 /playwright-report/
 /playwright/.cache/
 .playwright-mcp/
+
+# claude settings (keep .claude/CLAUDE.md but ignore user settings)
+.claude/settings.local.json