Dashboard: add sortable table UI and client-side sorting support — CSS for sortable headers, data-sort attributes, default sort on Created (desc), timestamp formatting, header click handling, and inclusion of sort param in paginated fetches. Records now show a formatted Created column with full timestamp in the title. Initialize sortable headers on load.
Telemetry/client: switch to sending a full JSON payload (allows create if initial PATCH failed) and include extra fields (ct_type, disk_size, core_count, ram_size, os_type, os_version, pve_version, method). pve_version is detected when available.
Server: extend FetchRecordsPaginated to accept a sort field, validate allowed sort fields to prevent injection, use the sort when building the PB API request (default -created), and propagate the sort query param from the HTTP handler to the fetch call.
Overall this enables server-side sorted pagination from the dashboard and richer telemetry records.
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