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.

ct/radicale.sh

@@ -35,12 +35,8 @@ function update_script() {
     systemctl stop radicale
     msg_ok "Stopped service"
 
-    create_backup /opt/radicale/users
-
     PYTHON_VERSION="3.13" setup_uv
-    CLEAN_INSTALL=1 fetch_and_deploy_gh_release "Radicale" "Kozea/Radicale" "tarball" "latest" "/opt/radicale"
-
-    restore_backup
+    CLEAN_INSTALL=1 CLEAN_INSTALL_KEEP="users" fetch_and_deploy_gh_release "Radicale" "Kozea/Radicale" "tarball" "latest" "/opt/radicale"
 
     if grep -q 'start.sh' /etc/systemd/system/radicale.service; then
       sed -i -e '/^Description/i[Unit]' \