feat(dashboard+api): card-based dashboard, camelCase API, UTC fixes

Dashboard: new Syncfusion card layout, global stats, filters, health bars, active event display, client details, bulk restart, 15s auto-refresh, manual refresh toasts
API: standardized responses to camelCase; added serializers.py and updated events endpoints
Time: ensured UTC storage; frontend appends 'Z' for parsing and displays local time
Docs: updated copilot-instructions.md, README.md, TECH-CHANGELOG.md
Program Info: bumped to 2025.1.0-alpha.12 with user-facing changelog
BREAKING: external API consumers must migrate field names from PascalCase to camelCase.

rsync-to-samba.sh

@@ -0,0 +1,46 @@
+#!/bin/bash
+# Rsync to Samba share using permanent fstab mount
+# Usage: ./rsync-to-samba.sh
+
+set -euo pipefail
+
+# Local source directory
+SOURCE="./infoscreen_server_2025"
+
+# Destination parent mount from fstab
+DEST_PARENT="/mnt/nas_share"
+DEST_SUBDIR="infoscreen_server_2025"
+DEST_PATH="$DEST_PARENT/$DEST_SUBDIR"
+
+# Exclude file (allows override via env)
+EXCLUDE_FILE="${EXCLUDE_FILE:-exclude.txt}"
+
+# Basic validations
+if [ ! -d "$SOURCE" ]; then
+  echo "Source directory not found: $SOURCE" >&2
+  exit 1
+fi
+
+if [ ! -f "$EXCLUDE_FILE" ]; then
+  echo "Exclude file not found: $EXCLUDE_FILE (expected in repo root)." >&2
+  exit 1
+fi
+
+# Ensure the fstab-backed mount is active; don't unmount after sync
+if ! mountpoint -q "$DEST_PARENT"; then
+  echo "Mount point $DEST_PARENT is not mounted. Attempting to mount via fstab..."
+  if ! sudo mount "$DEST_PARENT"; then
+    echo "Failed to mount $DEST_PARENT. Check your /etc/fstab entry and /root/.nas-credentials." >&2
+    exit 1
+  fi
+fi
+
+# Ensure destination directory exists
+mkdir -p "$DEST_PATH"
+
+echo "Syncing files to $DEST_PATH ..."
+rsync -avz --progress \
+  --exclude-from="$EXCLUDE_FILE" \
+  "$SOURCE/" "$DEST_PATH/"
+
+echo "Sync completed successfully."