feat: enable Fedora 44 server variant with systemd-boot

- re-enable the commented-out server recipe group
- repository: Fedora 44 only (was 43/rawhide)
- bootloader: systemd-boot (was grub)
- explicit initial-setup: server choice
- yields dish server_44_standard_systemd-boot_server_guest-agents.cfg

cook/recipes_manifest.yaml

@@ -26,15 +26,16 @@ recipes:
         hardware-support: [true, false]
         guest-agents: [true, false]
 
-#  # Server variants
-#  - name: server
-#    variants:
-#      - repository: ["43", "rawhide"]
-#        storage: standard
-#        bootloader: grub
-#        hardware-support: false
-#        guest-agents: true
-#
+  # Server variants
+  - name: server
+    variants:
+      - repository: ["44"]
+        storage: standard
+        bootloader: systemd-boot
+        hardware-support: false
+        guest-agents: true
+        initial-setup: server
+
 #  # Hypervisor variants
 #  - name: hypervisor
 #    variants: