datum-gateway: target bitcoin and edge groups instead of hostnames

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

ansible/services/datum-gateway/deploy_datum_gateway_playbook.yml

@@ -25,7 +25,7 @@
 #   bitcoin_rpc_password        - Shared with the bitcoin-knots deployment
 
 - name: Deploy DATUM Gateway on knots_box_local
-  hosts: knots_box_local
+  hosts: bitcoin
   become: yes
   vars_files:
     - ../../infra_vars.yml
@@ -470,7 +470,7 @@
 # Caddy Reverse Proxy for DATUM Dashboard (on vipy)
 # ===========================================
 - name: Configure Caddy reverse proxy for DATUM Gateway dashboard on vipy
-  hosts: vipy
+  hosts: edge
   become: yes
   vars_files:
     - ../../infra_vars.yml
@@ -663,7 +663,7 @@
 # over the Tailscale network, matching the Bitcoin P2P proxy pattern.
 # ===========================================
 - name: Setup public Stratum port forwarding on vipy via systemd-socket-proxyd
-  hosts: vipy
+  hosts: edge
   become: yes
   vars_files:
     - ../../infra_vars.yml