chore: normalize quote style in playbooks (#9)

## Summary
- Standardize single quotes to double quotes across deploy, destroy, provision, and restore playbooks

## Test plan
- No functional changes — formatting only

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Reviewed-on: #9
Co-authored-by: M.V. Hutz <git@maximhutz.me>
Co-committed-by: M.V. Hutz <git@maximhutz.me>

playbooks/provision.yml

@@ -6,7 +6,7 @@
   tasks:
     - name: Reconfigure and plan.
       community.general.terraform:
-        project_path: '../terraform'
+        project_path: "../terraform"
         state: "planned"
         plan_file: plan.out
         init_reconfigure: true
@@ -17,7 +17,7 @@
 
     - name: Apply.
       community.general.terraform:
-        project_path: '../terraform'
+        project_path: "../terraform"
         state: "present"
         plan_file: plan.out
         backend_config: "{{ terraform.backend }}"
@@ -36,4 +36,4 @@
       ansible.builtin.copy:
         content: "{{ terraform_apply.outputs }}"
         dest: ../dist/terraform_outputs.yml
-        mode: '0755'
+        mode: "0755"