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/package.json

@@ -1,29 +1,29 @@
-{
-  "name": "frontend",
-  "private": true,
-  "version": "1.0.13",
-  "type": "module",
-  "engines": {
-    "node": ">=22.0.0"
-  },
-  "scripts": {
-    "dev": "vite",
-    "build": "tsc && vite build",
-    "preview": "vite preview",
-    "lint": "tsc --noEmit",
-    "test": "vitest run",
-    "test:coverage": "vitest run --coverage",
-    "test:watch": "vitest"
-  },
-  "devDependencies": {
-    "@vitest/coverage-v8": "^4.1.10",
-    "@vitest/ui": "^4.1.10",
-    "jsdom": "^30.0.1",
-    "typescript": "~6.0.2",
-    "vite": "^8.2.0",
-    "vitest": "^4.1.10"
-  },
-  "dependencies": {
-    "hls.js": "^1.6.16"
-  }
-}
+{
+  "name": "frontend",
+  "private": true,
+  "version": "1.0.13",
+  "type": "module",
+  "engines": {
+    "node": ">=22.0.0"
+  },
+  "scripts": {
+    "dev": "vite",
+    "build": "tsc && vite build",
+    "preview": "vite preview",
+    "lint": "tsc --noEmit",
+    "test": "vitest run",
+    "test:coverage": "vitest run --coverage",
+    "test:watch": "vitest"
+  },
+  "devDependencies": {
+    "@vitest/coverage-v8": "^4.1.10",
+    "@vitest/ui": "^4.1.10",
+    "jsdom": "^30.0.1",
+    "typescript": "~6.0.2",
+    "vite": "^8.2.0",
+    "vitest": "^4.1.10"
+  },
+  "dependencies": {
+    "hls.js": "^1.6.16"
+  }
+}