feat: open console in new tab instead of iframe panel

- Remove ConsolePanel and /api/vnc route (iframe session auth won't work cross-origin)
- VMList/LXCList console buttons now open Proxmox web UI console in new tab
- Use web UI console URL format so browser session cookies handle auth automatically
- Add resize=scale and xtermjs=1 for better terminal UX

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/app/api/lxc/route.js

@@ -17,7 +17,7 @@ export async function GET(_req) {
           ...lxcs.map((lxc) => ({
             ...lxc,
             node: node.name,
-            consoleUrl: `${PROXMOX_WEB_URL}/?console=lxc&novnc=1&node=${encodeURIComponent(node.name)}&vmid=${lxc.vmid}&token=${encodeURIComponent(PROXMOX_CONSOLE_TOKEN)}`,
+            consoleUrl: `${PROXMOX_WEB_URL}/?console=lxc&vmid=${lxc.vmid}&node=${encodeURIComponent(node.name)}&resize=scale&xtermjs=1`,
           })),
         );
       } catch { /* skip node */ }