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.

.editorconfig

@@ -1,55 +1,55 @@
-# EditorConfig is awesome: https://editorconfig.org
-root = true
-
-# -------------------------------------------------
-# General settings – apply to all files
-# -------------------------------------------------
-[*]
-charset = utf-8
-end_of_line = lf
-insert_final_newline = true
-trim_trailing_whitespace = true
-
-# -------------------------------------------------
-# Markdown (*.md)
-# -------------------------------------------------
-[*.md]
-max_line_length = off        # Markdown lines can be long
-trim_trailing_whitespace = false   # Preserve intentional spaces
-
-# -------------------------------------------------
-# Go (*.go)
-# -------------------------------------------------
-[*.go]
-indent_style = tab
-indent_size = 4
-trim_trailing_whitespace = true
-max_line_length = 100
-
-# -------------------------------------------------
-# JavaScript & TypeScript (*.js, *.jsx, *.ts, *.tsx)
-# -------------------------------------------------
-[*.{js,jsx,ts,tsx}]
-indent_style = space
-indent_size = 2
-insert_final_newline = true
-trim_trailing_whitespace = true
-max_line_length = 120
-
-# -------------------------------------------------
-# HTML (*.html, *.htm)
-# -------------------------------------------------
-[*.{html,htm}]
-indent_style = space
-indent_size = 2
-max_line_length = 120
-trim_trailing_whitespace = true
-
-# -------------------------------------------------
-# CSS & SCSS (*.css, *.scss)
-# -------------------------------------------------
-[*.{css,scss}]
-indent_style = space
-indent_size = 2
-max_line_length = 120
-trim_trailing_whitespace = true
+# EditorConfig is awesome: https://editorconfig.org
+root = true
+
+# -------------------------------------------------
+# General settings – apply to all files
+# -------------------------------------------------
+[*]
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+# -------------------------------------------------
+# Markdown (*.md)
+# -------------------------------------------------
+[*.md]
+max_line_length = off        # Markdown lines can be long
+trim_trailing_whitespace = false   # Preserve intentional spaces
+
+# -------------------------------------------------
+# Go (*.go)
+# -------------------------------------------------
+[*.go]
+indent_style = tab
+indent_size = 4
+trim_trailing_whitespace = true
+max_line_length = 100
+
+# -------------------------------------------------
+# JavaScript & TypeScript (*.js, *.jsx, *.ts, *.tsx)
+# -------------------------------------------------
+[*.{js,jsx,ts,tsx}]
+indent_style = space
+indent_size = 2
+insert_final_newline = true
+trim_trailing_whitespace = true
+max_line_length = 120
+
+# -------------------------------------------------
+# HTML (*.html, *.htm)
+# -------------------------------------------------
+[*.{html,htm}]
+indent_style = space
+indent_size = 2
+max_line_length = 120
+trim_trailing_whitespace = true
+
+# -------------------------------------------------
+# CSS & SCSS (*.css, *.scss)
+# -------------------------------------------------
+[*.{css,scss}]
+indent_style = space
+indent_size = 2
+max_line_length = 120
+trim_trailing_whitespace = true