feat(panel): surface dev-build version in UI, bot, and CLI

A dev build now shows its `dev+<commit>` identity instead of a misleading stable-looking version in the sidebar badge, dashboard card, update modal, Telegram status report, startup log, and `x-ui -v`. Adds a shared formatPanelVersion helper (single v prefix; dev labels shown verbatim) and fixes the mobile-tag double-v.

Renames the version getters for clarity: config.GetVersion to GetBaseVersion (raw embedded version), config.GetReportedVersion to GetPanelVersion (advertised/displayed), and the xray process GetVersion to GetXrayVersion.

frontend/src/lib/panel-version.ts

@@ -14,6 +14,18 @@ function parseVersionParts(version: string): [number, number, number] | null {
   return [out[0], out[1], out[2]];
 }
 
+// Format a panel version for display. Dev builds report a "dev+<commit>"
+// identity (see config.GetPanelVersion); show those — and any other
+// non-numeric label — verbatim. Semantic versions get a single normalized "v"
+// prefix, so a raw "v3.4.0" tag and a bare "3.4.0" both render as "v3.4.0"
+// instead of doubling up to "vv3.4.0".
+export function formatPanelVersion(version: string | undefined | null): string {
+  const v = (version || '').trim();
+  if (!v) return '';
+  const normalized = v.replace(/^v/i, '');
+  return /^\d/.test(normalized) ? `v${normalized}` : v;
+}
+
 export function isPanelUpdateAvailable(latest: string, current: string): boolean {
   if (!latest || !current) return false;
   const a = parseVersionParts(latest);