Read OP_SERVICE_ACCOUNT_TOKEN from extra-vars, not controller env

Semaphore injects environment secrets as ansible extra-vars, not as
process env vars, so lookup('env','OP_SERVICE_ACCOUNT_TOKEN') resolved
to empty string and the op CLI hung waiting for interactive auth.
Reference the variable directly instead.

playbooks/n8n.yml

@@ -30,7 +30,7 @@
       become: false
       no_log: true
       environment:
-        OP_SERVICE_ACCOUNT_TOKEN: "{{ lookup('env','OP_SERVICE_ACCOUNT_TOKEN') }}"
+        OP_SERVICE_ACCOUNT_TOKEN: "{{ OP_SERVICE_ACCOUNT_TOKEN }}"
 
     # 🔐 Load existing secrets
     - name: Load secrets from 1Password
@@ -44,7 +44,7 @@
       become: false
       no_log: true
       environment:
-        OP_SERVICE_ACCOUNT_TOKEN: "{{ lookup('env','OP_SERVICE_ACCOUNT_TOKEN') }}"
+        OP_SERVICE_ACCOUNT_TOKEN: "{{ OP_SERVICE_ACCOUNT_TOKEN }}"
 
     - name: Set secrets from 1Password
       when: op_check.rc == 0
@@ -84,7 +84,7 @@
           "postgres_password={{ n8n_postgres_password }}" \
           "encryption_key={{ n8n_encryption_key }}"
       environment:
-        OP_SERVICE_ACCOUNT_TOKEN: "{{ lookup('env','OP_SERVICE_ACCOUNT_TOKEN') }}"
+        OP_SERVICE_ACCOUNT_TOKEN: "{{ OP_SERVICE_ACCOUNT_TOKEN }}"
 
     # 🧱 Infrastructure
     - name: Ensure stack directory exists