suggestarr: keep the data where the app actually reads it (#17317)

* suggestarr: keep the data where the app actually reads it

The env file sets CONFIG_DIR=/opt/suggestarr_data and the service passes
it through, but SuggestArr never reads that variable. Its database
manager builds the path from the application directory:

  DB_PATH = os.path.join(BASE_DIR, 'config', 'config_files', 'requests.db')

so config.yaml, requests.db and secret.key live under /opt/suggestarr,
which the update wipes with CLEAN_INSTALL. Every update came back as a
fresh install.

Make config/config_files a symlink to /opt/suggestarr_data and lay it
down again after each deploy, since the deploy replaces it with a real
directory. Existing installs have their files copied across first, with
cp -an so anything already in the data directory wins.

CONFIG_DIR stays in the env file: it is inert today and costs nothing if
upstream starts reading it.

* suggestarr: let a failed migration stop the update

The || true was wrong and the review caught it. CLEAN_INSTALL wipes
/opt/suggestarr right after this copy, so swallowing a failure here
means the source is deleted with nothing carried across.

The guard was not even doing anything: cp -an exits 0 when it skips a
file that already exists in the target, which is the only case that
looked like it needed one. It only returns non-zero on a real failure,
which is exactly when the update has to stop - and it now stops before
the deploy, with the original data still in place.

  cp -an, target file exists  -> exit 0, continues
  cp -an, source missing      -> exit 1, ERR trap, aborts before deploy

2>/dev/null goes as well, so the reason is visible.

ct/suggestarr.sh

@@ -37,8 +37,19 @@ function update_script() {
     systemctl stop suggestarr
     msg_ok "Stopped Service"
 
+    mkdir -p /opt/suggestarr_data
+    if [[ -d /opt/suggestarr/config/config_files && ! -L /opt/suggestarr/config/config_files ]]; then
+      msg_info "Migrating Configuration"
+      cp -an /opt/suggestarr/config/config_files/. /opt/suggestarr_data/
+      msg_ok "Migrated Configuration to /opt/suggestarr_data"
+    fi
+
     CLEAN_INSTALL=1 fetch_and_deploy_gh_release "suggestarr" "giuseppe99barchetta/SuggestArr" "tarball"
 
+    mkdir -p /opt/suggestarr/config
+    rm -rf /opt/suggestarr/config/config_files
+    ln -sfn /opt/suggestarr_data /opt/suggestarr/config/config_files
+
     msg_info "Building Frontend"
     cd /opt/suggestarr/client
     $STD npm install

install/suggestarr-install.sh

@@ -38,7 +38,9 @@ $STD uv pip install --python /opt/suggestarr/.venv -r /opt/suggestarr/api_servic
 msg_ok "Set up Python Environment"
 
 msg_info "Configuring SuggestArr"
-mkdir -p /opt/suggestarr_data
+mkdir -p /opt/suggestarr_data /opt/suggestarr/config
+rm -rf /opt/suggestarr/config/config_files
+ln -sfn /opt/suggestarr_data /opt/suggestarr/config/config_files
 cat <<EOF >/opt/suggestarr.env
 SUGGESTARR_PORT=5000
 LOG_LEVEL=info