Update caddy snippet to reference proxy.unturf.com config

caddy/factory-auth.caddy

@@ -1,7 +1,16 @@
-handle /hemp-bioplastic/process/factory/* {
-	basicauth {
-		# Generate a hash: caddy hash-password
-		# Then add a line here: username <hash>
-	}
-	file_server
-}
+# Factory basic auth lives in proxy.unturf.com/ingress/Caddyfile
+# Configured as a handle block inside the unturf.com site block.
+#
+# To change the password:
+#   ssh -p 22222 root@proxy.uncloseai.com "caddy hash-password --plaintext NEW_PASSWORD"
+#   Edit proxy.unturf.com/ingress/Caddyfile, replace the hash
+#   Push to main, CI deploys automatically
+#
+# Current config:
+#   handle /hemp-bioplastic/process/factory/* {
+#       basicauth {
+#           fox <bcrypt-hash>
+#       }
+#       root * /opt/www/unturf
+#       file_server
+#   }