playbooks: stop re-runs overwriting live config

Three seeding tasks used copy without force: false, so every run replaced the
real file with the starter one:

- personal-blog: the placeholder index.html over the deployed site.
- lnbits: .env.example over .env - a new AUTH_SECRET_KEY, logging every
  user out, and it would have clobbered a restored .env.
- forgejo: a two-line app.ini stub over the real config, losing
  INTERNAL_TOKEN, the JWT secrets, the DB path and ROOT_URL.

All three now seed a fresh install only. Found while restoring each from
backup on 2026-10-17.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

ansible/services/personal-blog/deploy_personal_blog_playbook.yml

@@ -45,6 +45,9 @@
         owner: "{{ ansible_user }}"
         group: www-data
         mode: '0664'
+        # Only on a fresh web root. Without this, every re-run (and site.yml)
+        # overwrote the real deployed index.html with the placeholder.
+        force: false
 
     - name: Publish the blog through Caddy
       ansible.builtin.include_role: