feat: implement comprehensive variable management system

- Create standardized group_vars directory structure
- Add domains.yml with centralized subdomain mappings
- Add infrastructure.yml with network, SMTP, and path config
- Reorganize vault.yml secrets by service with consistent naming
- Update 15+ Docker compose templates to use new variable structure
- Simplify playbook commands by removing --extra-vars requirement
- Replace hardcoded domains/IPs with template variables
- Standardize secret references across all services

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

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

group_vars/docker/services.yml

@@ -0,0 +1,25 @@
+# Docker Services Configuration
+
+# Service categories for organization
+service_categories:
+  infrastructure: ["caddy", "authentik", "dockge"]
+  development: ["gitea", "codeserver", "conduit"]
+  media: ["audiobookshelf", "calibre", "ghost", "pinchflat", "pinry", "hoarder", "manyfold"]
+  productivity: ["paperlessngx", "baikal", "syncthing", "mmdl", "heyform", "dawarich", "pingvin"]
+  communication: ["gotosocial", "postiz"]
+  monitoring: ["glance", "changedetection", "appriseapi"]
+
+# Common service configuration
+services:
+  common:
+    restart_policy: "unless-stopped"
+    network: "{{ docker.network_name }}"
+    
+  # Service-specific configurations
+  dawarich:
+    db_name: "dawarich"
+    db_user: "dawarich"
+    
+  mmdl:
+    db_name: "mmdl"
+    db_user: "mmdl"