Refactor load testing scripts to support Bash and PowerShell

- Updated README.md to reflect changes in load testing commands and added usage examples for Bash scripts.
- Converted PowerShell load testing scripts to Bash equivalents for better cross-platform compatibility.
- Added new Bash scripts: run-loadtests.sh, summarize-artillery.sh, and summarize-k6.sh to mirror existing PowerShell functionality.
- Updated admin-api.js and ws-chat.yml for consistency and improved performance metrics reporting.
- Enhanced error handling and output formatting in summary scripts for better readability.

frontend/wrangler.toml

@@ -1,6 +1,6 @@
-name = "linearvoid-frontend"
-compatibility_date = "2025-08-01"
-
-[assets]
-directory = "./dist"
-not_found_handling = "single-page-application"
+name = "linearvoid-frontend"
+compatibility_date = "2025-08-01"
+
+[assets]
+directory = "./dist"
+not_found_handling = "single-page-application"