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.

dashboard/.gitignore

@@ -0,0 +1,24 @@
+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+pnpm-debug.log*
+lerna-debug.log*
+
+node_modules
+dist
+dist-ssr
+*.local
+
+# Editor directories and files
+.vscode/*
+!.vscode/extensions.json
+.idea
+.DS_Store
+*.suo
+*.ntvs*
+*.njsproj
+*.sln
+*.sw?