feat: Add APP_NAME env support for branding and deployment

- Make app name configurable via APP_NAME env variable - Update UI,
HTML, Docker, scripts, and k8s to use APP_NAME - Add process-html.sh for
template substitution - Document APP_NAME usage in
docs/APP_NAME_CONFIGURATION.md - Update Dockerfile, compose, and scripts
for dynamic naming - Add index.html.template for environment-based
branding

scripts/process-html.sh

@@ -0,0 +1,24 @@
+#!/bin/bash
+
+# Process HTML template with environment variables
+# This script substitutes environment variables in index.html.template
+
+set -e
+
+# Default values
+APP_NAME="${APP_NAME:-RxMinder}"
+
+# Input and output files
+TEMPLATE_FILE="index.html.template"
+OUTPUT_FILE="index.html"
+
+# Check if template exists
+if [[ ! -f "$TEMPLATE_FILE" ]]; then
+    echo "Error: Template file $TEMPLATE_FILE not found"
+    exit 1
+fi
+
+# Process template with environment variable substitution
+envsubst '$APP_NAME' < "$TEMPLATE_FILE" > "$OUTPUT_FILE"
+
+echo "✅ Processed $TEMPLATE_FILE -> $OUTPUT_FILE with APP_NAME=$APP_NAME"