docs: replace kindred.internal with example.internal in all docs and config

Replace all references to internal hostnames (silo.kindred.internal,
psql.kindred.internal, minio.kindred.internal, ipa.kindred.internal,
keycloak.kindred.internal) with example.internal equivalents.

Replace gitea.kindred.internal and git.kindred.internal with the public
git.kindred-systems.com instance. Also fix stale silo-0062 repo name
in setup-host.sh and DEPLOYMENT.md.

docs/AUTH_USER_GUIDE.md

@@ -38,7 +38,7 @@ API tokens allow the FreeCAD plugin, scripts, and CI pipelines to authenticate w
 ### Creating a Token (CLI)
 
 ```sh
-export SILO_API_URL=https://silo.kindred.internal
+export SILO_API_URL=https://silo.example.internal
 export SILO_API_TOKEN=silo_<your-existing-token>
 
 silo token create --name "CI pipeline"
@@ -140,7 +140,7 @@ auth:
 
   ldap:
     enabled: true
-    url: "ldaps://ipa.kindred.internal"
+    url: "ldaps://ipa.example.internal"
     base_dn: "dc=kindred,dc=internal"
     user_search_dn: "cn=users,cn=accounts,dc=kindred,dc=internal"
     user_attr: "uid"
@@ -170,10 +170,10 @@ auth:
 
   oidc:
     enabled: true
-    issuer_url: "https://keycloak.kindred.internal/realms/silo"
+    issuer_url: "https://keycloak.example.internal/realms/silo"
     client_id: "silo"
     client_secret: ""  # Set via SILO_OIDC_CLIENT_SECRET
-    redirect_url: "https://silo.kindred.internal/auth/callback"
+    redirect_url: "https://silo.example.internal/auth/callback"
     scopes: ["openid", "profile", "email"]
     admin_role: "silo-admin"
     editor_role: "silo-editor"
@@ -186,7 +186,7 @@ auth:
 auth:
   cors:
     allowed_origins:
-      - "https://silo.kindred.internal"
+      - "https://silo.example.internal"
 ```
 
 ## Environment Variables
@@ -254,4 +254,4 @@ UPDATE users SET password_hash = '<bcrypt-hash>', is_active = true WHERE usernam
 
 - Verify the token is set in FreeCAD preferences or `SILO_API_TOKEN`
 - Check the API URL points to the correct server
-- Test with curl: `curl -H "Authorization: Bearer silo_..." https://silo.kindred.internal/api/items`
+- Test with curl: `curl -H "Authorization: Bearer silo_..." https://silo.example.internal/api/items`