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/valkey-install.sh

@@ -19,7 +19,7 @@ setup_deb_based() {
   $STD apt install -y valkey openssl
   sed -i 's/^bind .*/bind 0.0.0.0/' /etc/valkey/valkey.conf
 
-  PASS="$(openssl rand -base64 48 | tr -dc 'a-zA-Z0-9' | head -c32)"
+  PASS="$(random_password 32)"
   echo "requirepass $PASS" >>/etc/valkey/valkey.conf
   echo "$PASS" >~/valkey.creds
   chmod 600 ~/valkey.creds
@@ -80,7 +80,7 @@ setup_alpine() {
   $STD apk add valkey valkey-openrc valkey-cli
   sed -i 's/^bind .*/bind 0.0.0.0/' /etc/valkey/valkey.conf
 
-  PASS="$(head -c 100 /dev/urandom | tr -dc 'a-zA-Z0-9' | head -c32)"
+  PASS="$(random_password 32)"
   echo "requirepass $PASS" >>/etc/valkey/valkey.conf
   echo "$PASS" >~/valkey.creds
   chmod 600 ~/valkey.creds