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>

todo.md

@@ -9,7 +9,7 @@
   roles/docker/tasks/
   ├── main.yml (orchestrator)
   ├── infrastructure/ (caddy, authentik, dockge)
-  ├── development/ (gitea, codeserver, conduit)
+  ├── development/ (gitea, codeserver)
   ├── media/ (audiobookshelf, calibre, ghost, pinchflat, pinry, hoarder, manyfold)
   ├── productivity/ (paperless, baikal, syncthing, mmdl, heyform, dawarich, pingvin)
   ├── communication/ (gotosocial, postiz)