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.

infrastructure/nginx/Dockerfile

@@ -1,21 +1,21 @@
-# Stage 1: Build frontend
-FROM node:20-alpine AS builder
-WORKDIR /build
-COPY frontend/package*.json ./
-RUN npm ci
-COPY frontend/ .
-RUN npm run build
-
-# Stage 2: Nginx with bundled frontend
-FROM nginx:alpine
-
-COPY infrastructure/nginx/nginx.conf /etc/nginx/nginx.conf
-
-# Copy prebuilt frontend from builder stage
-COPY --from=builder /build/dist/ /srv/frontend/
-
-# Create HLS directory
-RUN mkdir -p /srv/hls
-
-EXPOSE 80
+# Stage 1: Build frontend
+FROM node:20-alpine AS builder
+WORKDIR /build
+COPY frontend/package*.json ./
+RUN npm ci
+COPY frontend/ .
+RUN npm run build
+
+# Stage 2: Nginx with bundled frontend
+FROM nginx:alpine
+
+COPY infrastructure/nginx/nginx.conf /etc/nginx/nginx.conf
+
+# Copy prebuilt frontend from builder stage
+COPY --from=builder /build/dist/ /srv/frontend/
+
+# Create HLS directory
+RUN mkdir -p /srv/hls
+
+EXPOSE 80
 CMD ["nginx", "-g", "daemon off;"]