Huge role refactoring/cleanup. Other commits will propably follow. Because some bugs will exist. Still important for longrun and also for auto docs/help/slideshow generation

roles/web-app-mailu/meta/main.yml

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+---
+galaxy_info:
+  author: "Kevin Veen-Birkenbach"
+  description: "Revolutionize your email communications with Mailu, a secure and flexible mail server solution that integrates comprehensive features for managing digital correspondence reliably."
+  license: "CyMaIS NonCommercial License (CNCL)"
+  license_url: "https://s.veen.world/cncl"
+  company: |
+    Kevin Veen-Birkenbach
+    Consulting & Coaching Solutions
+    https://www.veen.world
+  galaxy_tags:
+    - mailu
+    - docker
+    - email
+    - mail server
+    - self-hosted
+  repository: "https://s.veen.world/cymais"
+  issue_tracker_url: "https://s.veen.world/cymaisissues"
+  documentation: "https://s.veen.world/cymais"
+  logo:
+    class: "fa-solid fa-envelope"
+  run_after:  
+    - web-app-keycloak

roles/web-app-mailu/meta/schema.yml

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+credentials:
+  secret_key:
+    description: "Secret key for cryptographic operations in Mailu (must be a 16-byte random string, hex-encoded)"
+    algorithm: "sha256"
+    validation: "^[a-f0-9]{32}$"
+
+  database_password:
+    description: "Password for the Mailu PostgreSQL or MariaDB database user"
+    algorithm: "bcrypt"
+    validation: "^\\$2[aby]\\$.{56}$"
+
+  api_token:
+    description: "Authentication token for accessing the Mailu RESTful API (minimum 3 characters)"
+    algorithm: "plain"
+    validation: "^.{3,}$"
+
+  initial_administrator_password:
+    description: "Initial password for the Mailu administrator account (used during setup)"
+    algorithm: "sha256"
+    validation: "^[a-f0-9]{64}$"
+
+  dkim_public_key:
+    description: "Public DKIM key for DNS configuration (TXT record)"
+    algorithm: "plain"
+    validation: "^.{64,}$"

roles/web-app-mailu/meta/users.yml

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+users:
+  administrator:
+    email:                "administrator@{{ primary_domain }}"   # Administrator Email for DNS Records