fix(matomo,papermark,slink): fix db access, creds path, build env, sqlite create

- matomo: move creds to /root/matomo.creds (out of webroot), keep tests/ dir,
  block dotfiles in Caddy (@blocked /.* pattern)
- papermark: add NEXT_PUBLIC_APP_BASE_HOST and NEXT_PUBLIC_WEBHOOK_BASE_HOST
  placeholder env vars to prevent undefined 'value' in has:host routes
  causing Next.js build failure
- slink: replace doctrine:database:create with touch for SQLite (getCreateDatabaseSQL
  not supported by SQLitePlatform)

install/papermark-install.sh

@@ -29,14 +29,13 @@ POSTGRES_PRISMA_URL_NON_POOLING=${DB_URL}
 NEXTAUTH_SECRET=$(openssl rand -base64 32)
 NEXTAUTH_URL=http://${LOCAL_IP}:3000
 NEXT_PUBLIC_BASE_URL=http://${LOCAL_IP}:3000
+NEXT_PUBLIC_APP_BASE_HOST=app.example.local
+NEXT_PUBLIC_WEBHOOK_BASE_HOST=webhooks.example.local
 NODE_ENV=production
 EOF
 $STD npm install
 $STD npx prisma generate
 $STD npx prisma migrate deploy
-for f in next.config.js next.config.mjs next.config.ts; do
-  [[ -f "/opt/papermark/$f" ]] && sed -i 's/{"type":"host"}/{"type":"host","value":".*"}/g' "/opt/papermark/$f"
-done
 $STD npm run build
 msg_ok "Set up Papermark"