refactor: reorganize docker role into logical service groups

Break down the monolithic main.yml (176 lines) into organized service categories:

- infrastructure/ (caddy, authentik, dockge) - Core platform components
- development/ (gitea, codeserver, conduit) - Development tools
- media/ (audiobookshelf, calibre, ghost, pinchflat, etc.) - Content services
- productivity/ (paperless, baikal, syncthing, mmdl, etc.) - Personal organization
- monitoring/ (glance, changedetection, appriseapi) - System monitoring
- communication/ (gotosocial, postiz) - Social/messaging services

Benefits:
- Improved maintainability with logical grouping
- Better dependency management between service categories
- Enhanced tag-based deployment (can deploy by category)
- Cleaner organization for 25+ services

All individual service tags remain functional for backwards compatibility.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

roles/docker/tasks/productivity/mmdl.yml

@@ -0,0 +1,25 @@
+---
+- name: Create mmdl directories
+  ansible.builtin.file:
+    path: "{{ item }}"
+    state: directory
+  loop:
+    - /opt/stacks/mmdl
+    - /opt/stacks/mmdl/data
+    - /opt/stacks/mmdl/mysql
+
+- name: Template mmdl environment file
+  ansible.builtin.template:
+    src: mmdl-env.j2
+    dest: /opt/stacks/mmdl/.env.local
+
+- name: Template mmdl compose file
+  ansible.builtin.template:
+    src: mmdl-compose.yml.j2
+    dest: /opt/stacks/mmdl/compose.yml
+
+- name: Deploy mmdl stack
+  community.docker.docker_compose_v2:
+    project_src: /opt/stacks/mmdl
+    files:
+      - compose.yml