Add Authentik SSO service and refactor Valkey configuration to use native tools and consolidated systemd service

roles/authentik/tasks/database.yml

@@ -0,0 +1,28 @@
+---
+# Authentik Database Management - Self-Contained Database Setup
+
+- name: Create Authentik database user
+  postgresql_user:
+    name: "{{ authentik_db_user }}"
+    password: "{{ authentik_db_password }}"
+    encrypted: yes
+  become: yes
+  become_user: postgres
+
+- name: Create Authentik database
+  postgresql_db:
+    name: "{{ authentik_db_name }}"
+    owner: "{{ authentik_db_user }}"
+    encoding: UTF8
+    template: template0
+  become: yes
+  become_user: postgres
+
+- name: Grant all privileges on Authentik database to user
+  postgresql_privs:
+    db: "{{ authentik_db_name }}"
+    privs: ALL
+    type: database
+    role: "{{ authentik_db_user }}"
+  become: yes
+  become_user: postgres