fix(opnform): address review feedback on vars header and meta boilerplate

* vars/main.yml: header was 'vars file for homarr' (copy-paste from the
  homarr role). Fixed to 'vars file for opnform'. File body is empty.
* meta/main.yml: replace ansible-galaxy init boilerplate with real
  metadata — author, description, license (MIT-0), min_ansible_version
  set to '2.15' as a string (galaxy schema requires str), galaxy_tags
  for discovery, and an empty dependencies list.

The third inline finding (dead roles/opnform/templates/compose.yml.j2)
is resolved by dropping the WIP commit a6f301e during the rebase rather
than removing it in a separate commit — the file no longer exists in
the rebased history.

roles/opnform/meta/main.yml

@@ -1,35 +1,16 @@
 #SPDX-License-Identifier: MIT-0
 galaxy_info:
-  author: your name
+  author: Tobias Wüst
-  description: your role description
+  description: Deploy OpnForm self-hosted form builder via Docker Compose behind Traefik
-  company: your company (optional)
+  company: Digitalboard
+  license: MIT-0
+  min_ansible_version: "2.15"
 
-  # If the issue tracker for your role is not on github, uncomment the
+  galaxy_tags:
-  # next line and provide a value
+    - opnform
-  # issue_tracker_url: http://example.com/issue/tracker
+    - forms
-
+    - docker
-  # Choose a valid license ID from https://spdx.org - some suggested licenses:
+    - traefik
-  # - BSD-3-Clause (default)
+    - oidc
-  # - MIT
-  # - GPL-2.0-or-later
-  # - GPL-3.0-only
-  # - Apache-2.0
-  # - CC-BY-4.0
-  license: license (GPL-2.0-or-later, MIT, etc)
-
-  min_ansible_version: 2.2
-
-  # If this a Container Enabled role, provide the minimum Ansible Container version.
-  # min_ansible_container_version:
-
-  galaxy_tags: []
-    # List tags for your role here, one per line. A tag is a keyword that describes
-    # and categorizes the role. Users find roles by searching for tags. Be sure to
-    # remove the '[]' above, if you add tags to this list.
-    #
-    # NOTE: A tag is limited to a single word comprised of alphanumeric characters.
-    #       Maximum 20 tags per role.
 
 dependencies: []
-  # List your role dependencies here, one per line. Be sure to remove the '[]' above,
-  # if you add dependencies to this list.

roles/opnform/vars/main.yml

@@ -1,3 +1,3 @@
 #SPDX-License-Identifier: MIT-0
 ---
-# vars file for homarr
+# vars file for opnform