feat: remove Conduit Matrix service

Remove all traces of the Conduit Matrix homeserver service including:
- Delete conduit-compose.yml.j2 template and conduit.yml task file
- Remove conduit from development services category
- Remove conduit Caddy reverse proxy configuration
- Remove conduit subdomain from domains.yml
- Remove conduit DNS A record from Route53
- Delete Matrix well-known files (client/server)
- Update all documentation from 25 to 24 services

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

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

group_vars/all/domains.yml

@@ -29,7 +29,6 @@ subdomains:
   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: