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/all/domains.yml

@@ -0,0 +1,39 @@
+# Domain Configuration
+primary_domain: "thesatelliteoflove.com"
+secondary_domain: "nerder.land"
+
+# Subdomain mappings
+subdomains:
+  auth: "auth.{{ primary_domain }}"
+  git: "git.{{ primary_domain }}"
+  cal: "cal.{{ primary_domain }}"
+  docs: "docs.{{ primary_domain }}"
+  phlog: "phlog.{{ primary_domain }}"  # Ghost blog
+  bookmarks: "bookmarks.{{ primary_domain }}"  # Hoarder/Karakeep
+  heyform: "forms.{{ secondary_domain }}"  # Heyform on nerder.land
+  media: "media.{{ primary_domain }}"
+  audio: "audio.{{ primary_domain }}"  # Audiobookshelf
+  books: "books.{{ primary_domain }}"  # Calibre
+  models: "models.{{ primary_domain }}"  # Manyfold
+  pinchflat: "pinchflat.{{ primary_domain }}"
+  pin: "pin.{{ primary_domain }}"  # Pinry
+  papers: "papers.{{ primary_domain }}"  # Paperless-NGX
+  tasks: "tasks.{{ primary_domain }}"  # MMDL
+  syncthing: "syncthing.{{ primary_domain }}"
+  loclog: "loclog.{{ primary_domain }}"  # Dawarich
+  pingvin: "pingvin.{{ primary_domain }}"
+  social: "social.{{ primary_domain }}"  # GoToSocial
+  post: "post.{{ primary_domain }}"  # Postiz
+  home: "home.{{ primary_domain }}"  # Glance
+  watcher: "watcher.{{ primary_domain }}"  # Changedetection
+  appriseapi: "appriseapi.{{ primary_domain }}"
+  dockge: "dockge.{{ primary_domain }}"
+  code: "code.{{ primary_domain }}"  # Code Server
+  chat: "chat.{{ primary_domain }}"  # Conduit Matrix
+
+# Email domains for notifications
+email_domains:
+  updates: "updates.{{ primary_domain }}"
+  auth_email: "auth@updates.{{ primary_domain }}"
+  git_email: "git@updates.{{ primary_domain }}"
+  cal_email: "cal@updates.{{ primary_domain }}"