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/forgejo/deploy_forgejo_playbook.yml

@@ -66,6 +66,10 @@
         owner: "{{ forgejo_user }}"
         group: "{{ forgejo_user }}"
         mode: '0644'
+        # Fresh install only: the web installer then writes the real config
+        # (INTERNAL_TOKEN, JWT secrets, DB path, ROOT_URL) into this file.
+        # Without force: false every re-run replaced it with this stub.
+        force: false
   
     - name: Download Forgejo systemd service file
       get_url: