Fix issues 2,3: move NextDNS profile ID to variable, upgrade to ed25519 key

- inventory.yml: replace id_rsa with id_ed25519, add nextdns_profile_id host var (closes #2, #3)
- config-nextdns.yml: reference nextdns_profile_id variable, add become: false

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

inventory.yml

@@ -5,4 +5,5 @@ all:
         UDMP:
           ansible_host: 192.168.1.1
           ansible_user: root
-          ansible_ssh_private_key_file: ~/.ssh/id_rsa
+          ansible_ssh_private_key_file: ~/.ssh/id_ed25519
+          nextdns_profile_id: "e3448e"

playbooks/config-nextdns.yml

@@ -1,5 +1,6 @@
 - name: Install and Configure NextDNS CLI
   hosts: UDM
+  become: false
   gather_facts: yes
 
   tasks:
@@ -12,5 +13,5 @@
 
     - name: Download and Install NextDNS CLI
       ansible.builtin.shell:
-        cmd: printf "i\ne3448e\nY\nY\nY" |sh -c 'sh -c "$(curl -sL https://nextdns.io/install)"'
-      when: nextdns_status.stdout == ""
+        cmd: "printf 'i\n{{ nextdns_profile_id }}\nY\nY\nY' | sh -c 'sh -c \"$(curl -sL https://nextdns.io/install)\"'"
+      when: nextdns_status.stdout == ""