feat(ansible): increase swap to 16GB and apply memory optimizations

- Resized swap file from 4GB to 16GB.
- Configured zswap pool (30%) and THP (madvise) via GRUB.
- Tuned kernel parameters for proactive reclaim and NVMe write-back.
- Integrated systemd-oomd for user slice monitoring.
- Updated documentation and changelog.

ansible/roles/common/handlers/main.yml

@@ -0,0 +1,18 @@
+---
+- name: Update GRUB
+  command: update-grub
+  become: yes
+  tags: [grub, boot]
+
+- name: Restart systemd-oomd
+  systemd:
+    name: systemd-oomd
+    state: restarted
+  become: yes
+  tags: [systemd, oomd]
+
+- name: Reload systemd
+  systemd:
+    daemon_reload: yes
+  become: yes
+  tags: [systemd]