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.

backend/playout/Dockerfile

@@ -1,33 +1,33 @@
-FROM golang:1.25-alpine AS builder
-
-WORKDIR /app
-COPY src/ ./src/
-COPY src/go.mod src/go.sum ./
-
-# Download dependencies and build
-RUN go mod download
-RUN CGO_ENABLED=0 GOOS=linux GOFLAGS=-mod=mod go build -o /playlist-manager ./src/playlist.go
-
-FROM alpine:3.20
-
-# Install FFmpeg, curl for health checks, and basic tools
-RUN apk add --no-cache \
-    ffmpeg \
-    curl \
-    bash
-# Set working directory for playout
-WORKDIR /app
-# Create directories for playlist, media, HLS output, and emergency slate
-RUN mkdir -p /app/hls /app/media /app/playlists /app/slate
-# Copy the playout start script and the built playlist manager binary
-COPY start-playout.sh /app/
-# Copy demo data for out-of-the-box playout
-COPY demodata/ /app/
-# Copy the built playlist manager binary from the builder stage
-COPY --from=builder /playlist-manager /app/playlist-manager
-# Set execute permissions for the start script and playlist manager binary
-RUN chmod +x /app/start-playout.sh /app/playlist-manager
-# Expose HLS directory (will be served by nginx)
-VOLUME ["/app/hls"]
-# Default command runs the playout loop (which calls the Go validator)
+FROM golang:1.25-alpine AS builder
+
+WORKDIR /app
+COPY src/ ./src/
+COPY src/go.mod src/go.sum ./
+
+# Download dependencies and build
+RUN go mod download
+RUN CGO_ENABLED=0 GOOS=linux GOFLAGS=-mod=mod go build -o /playlist-manager ./src/playlist.go
+
+FROM alpine:3.20
+
+# Install FFmpeg, curl for health checks, and basic tools
+RUN apk add --no-cache \
+    ffmpeg \
+    curl \
+    bash
+# Set working directory for playout
+WORKDIR /app
+# Create directories for playlist, media, HLS output, and emergency slate
+RUN mkdir -p /app/hls /app/media /app/playlists /app/slate
+# Copy the playout start script and the built playlist manager binary
+COPY start-playout.sh /app/
+# Copy demo data for out-of-the-box playout
+COPY demodata/ /app/
+# Copy the built playlist manager binary from the builder stage
+COPY --from=builder /playlist-manager /app/playlist-manager
+# Set execute permissions for the start script and playlist manager binary
+RUN chmod +x /app/start-playout.sh /app/playlist-manager
+# Expose HLS directory (will be served by nginx)
+VOLUME ["/app/hls"]
+# Default command runs the playout loop (which calls the Go validator)
 CMD ["./start-playout.sh"]