fix: remove serial console (root cause of 30s boot delay), enable syslog logging, disk auto-detect

Root cause found: console=ttyS0,115200n8 causes 30-second timeout at every
systemd boot phase on hardware without a physical serial UART. Each phase
transition blocks waiting for the non-existent UART.

Changes:
- Remove console=ttyS0 from kickstart bootloader args and %post setup
- Enable Anaconda syslog forwarding (logging --host --port) for install visibility
- Improve syslog IP→MAC resolution (register from kickstart fetch + progress)
- Fix disk auto-detect: default to empty string (not /dev/sda) for NVMe support
- Enable SysRq magic keys (kernel.sysrq=1) for emergency reboot via JetKVM
- Simplify debug command: remove --sshd flag (inst.sshd always available),
  add /debug-setup.sh HTTP endpoint for nc listener setup
- Add labctl provision logs -f (follow mode with polling)
- Add syslog listener unit tests
- Enable syslog log capture test in integration suite

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

bastion/src/shared/src/protocol/index.ts

@@ -111,7 +111,7 @@ export type LabdBastionMessage =
   | { type: "command-install"; requestId: string; mac: string; hostname: string; disk?: string; role: string; os: string }
   | { type: "command-forget"; requestId: string; mac: string }
   | { type: "command-role-update"; requestId: string; mac: string; role: string }
-  | { type: "command-debug"; requestId: string; mac: string; sshd?: boolean; pxeBoot?: boolean }
+  | { type: "command-debug"; requestId: string; mac: string; pxeBoot?: boolean }
   | { type: "server-shutdown"; reconnectAfter: number };
 
 export type BastionMessageType = BastionMessage["type"];

bastion/src/shared/src/types/state.ts

@@ -101,7 +101,6 @@ export interface InstalledInfo {
 export interface DebugConfig {
   hostname: string;
   queued_at: string;
-  sshd?: boolean;
   pxeBoot?: boolean;
 }