Add so-postgres Salt states and integration wiring

Phase 1 of the PostgreSQL central data platform:
- Salt states: init, enabled, disabled, config, ssl, auth, sostatus
- TLS via SO CA-signed certs with postgresql.conf template
- Two-tier auth: postgres superuser + so_postgres application user
- Firewall restricts port 5432 to manager-only (HA-ready)
- Wired into top.sls, pillar/top.sls, allowed_states, firewall
  containers map, docker defaults, CA signing policies, and setup
  scripts for all manager-type roles

salt/postgres/auth.sls

@@ -0,0 +1,35 @@
+# Copyright Security Onion Solutions LLC and/or licensed to Security Onion Solutions LLC under one
+# or more contributor license agreements. Licensed under the Elastic License 2.0 as shown at
+# https://securityonion.net/license; you may not use this file except in compliance with the
+# Elastic License 2.0.
+
+{% from 'allowed_states.map.jinja' import allowed_states %}
+{% if sls in allowed_states %}
+
+  {% set DIGITS = "1234567890" %}
+  {% set LOWERCASE = "qwertyuiopasdfghjklzxcvbnm" %}
+  {% set UPPERCASE = "QWERTYUIOPASDFGHJKLZXCVBNM" %}
+  {% set SYMBOLS = "~!@#^&*()-_=+[]|;:,.<>?" %}
+  {% set CHARS = DIGITS~LOWERCASE~UPPERCASE~SYMBOLS %}
+  {% set so_postgres_user_pass = salt['pillar.get']('postgres:auth:users:so_postgres_user:pass', salt['random.get_str'](72, chars=CHARS)) %}
+
+postgres_auth_pillar:
+  file.managed:
+    - name: /opt/so/saltstack/local/pillar/postgres/auth.sls
+    - mode: 640
+    - reload_pillar: True
+    - contents: |
+        postgres:
+          auth:
+            users:
+              so_postgres_user:
+                user: so_postgres
+                pass: "{{ so_postgres_user_pass }}"
+    - show_changes: False
+{% else %}
+
+{{sls}}_state_not_allowed:
+  test.fail_without_changes:
+    - name: {{sls}}_state_not_allowed
+
+{% endif %}