Refactor/core qol adoption (#17655)

* Scripts: close every msg_info block with msg_ok

Past-tense msg_info calls that should have been msg_ok, notices that opened a block before a prompt, and blocks without a closing msg_ok. These already left a stale spinner; with core's block stack they would resume it after every later msg_ok.

* Generate passwords with random_password

openssl rand -base64 | tr -dc | head -c returned fewer characters than asked for, and the unfiltered | cut variants put / and + into passwords that end up in DSNs and sed expressions. Secrets an app decodes as base64 are unchanged. Requires community-scripts/core#61.

* Keep data directories through CLEAN_INSTALL instead of copying them

create_backup copied uploads, storage and similar directories twice per update and needed their size again in free space. CLEAN_INSTALL_KEEP moves them aside instead. Only directories the upstream release does not ship, in scripts that restored right after the fetch. Requires community-scripts/core#61.

* Drop the 300s uv timeout overrides

setup_uv exports UV_HTTP_TIMEOUT=600 now; the scripts' 300 only lowered it. Requires community-scripts/core#61.

install/miniflux-install.sh

@@ -19,7 +19,7 @@ fetch_and_deploy_gh_release "miniflux" "miniflux/v2" "binary" "latest"
 
 msg_info "Configuring Miniflux"
 ADMIN_NAME=admin
-ADMIN_PASS="$(openssl rand -base64 18 | tr -dc 'a-zA-Z0-9' | head -c13)"
+ADMIN_PASS="$(random_password 13)"
 cat <<EOF >/etc/miniflux.conf
 # See https://miniflux.app/docs/configuration.html
 DATABASE_URL=user=$PG_DB_USER password=$PG_DB_PASS dbname=$PG_DB_NAME sslmode=disable