feat(web-app-chess): add castling.club role with ports, networks, and build setup

- Added network subnet (192.168.103.192/28) and port 8050 for web-app-chess
- Replaced stub README with usability-focused description of castling.club
- Implemented config, vars, meta, and tasks for web-app-chess
- Added Dockerfile, docker-compose.yml, env, and docker-entrypoint.sh templates
- Integrated entrypoint asset placement
- Updated meta to reflect usability and software features

Ref: https://chatgpt.com/share/68b6c65a-3de8-800f-86b2-a110920cd50e

roles/web-app-chess/vars/main.yml

@@ -1 +1,25 @@
-application_id: web-app-chess
+# General
+application_id:                 "web-app-chess"
+database_type:                  "postgres"
+container_port:                 5080
+container_hostname:             "{{ domains | get_domain(application_id) }}"
+
+# App URLs & meta
+#CHESS_URL:                      "{{ domains | get_url(application_id, WEB_PROTOCOL) }}"
+CHESS_HOSTNAME:                 "{{ container_hostname }}"
+CHESS_ADMIN_URL:                ""
+CHESS_ADMIN_EMAIL:              ""
+
+# Docker image
+#CHESS_IMAGE:                    "{{ applications | get_app_conf(application_id, 'docker.services.application.image') }}"
+CHESS_VERSION:                  "{{ applications | get_app_conf(application_id, 'docker.services.application.version') }}"
+CHESS_CONTAINER:                "{{ applications | get_app_conf(application_id, 'docker.services.application.name') }}"
+CHESS_DATA_VOLUME:              "{{ applications | get_app_conf(application_id, 'docker.volumes.data') }}"
+
+# Build source
+CHESS_REPO_URL:                 "{{ applications | get_app_conf(application_id, 'source.repo') }}"
+CHESS_REPO_REF:                 "{{ applications | get_app_conf(application_id, 'source.ref') }}"
+
+# Security
+CHESS_HMAC_SECRET:              "{{ lookup('password', '/dev/null length=63 chars=ascii_letters,digits') }}"
+CHESS_KEY_FILENAME:             "signing-key"