Derive the pull target from the install location, so master.conf is safe to share between hosts

Plugin/unraid/Tools/storage_migrate.sh

@@ -281,12 +281,23 @@ echo "━━━ $ICON_GEAR Step 4: Update master.conf paths ━━━"
 NEW_MASTER="$DST/Configurations/master.conf"
 if [[ "$DRY_RUN" == false ]]; then
     if [[ -f "$NEW_MASTER" ]]; then
-        sed -i "s|^\(\s*TARGET_DIR\s*=\s*\)\"[^\"]*\"|\1\"$DST\"|"                              "$NEW_MASTER"
-        sed -i "s|^\(\s*DATA_DIR\s*=\s*\)\"[^\"]*\"|\1\"$DST/data\"|"                           "$NEW_MASTER"
-        sed -i "s|^\(\s*STATE_DIR\s*=\s*\)\"[^\"]*\"|\1\"${DST}/data/state\"|"                   "$NEW_MASTER"
-        echo "  TARGET_DIR → $DST ✅"
-        echo "  DATA_DIR   → $DST/data ✅"
-        echo "  STATE_DIR  → $DST/data/state ✅"
+        # Only rewrite a path that is a literal. These three are derived from SCRIPTS_DIR in
+        # current confs, which load_config.sh exports from its own location — so after the move
+        # they already point at the new install and hardcoding them here would turn a
+        # self-correcting value back into one that has to be maintained. Older confs still carry
+        # literals, so the substitution stays for them.
+        _mig_path() {   # $1=key  $2=new value
+            if grep -qE "^\s*$1\s*=\s*\"[^\"]*\\\$\{?(SCRIPTS_DIR|DATA_DIR)" "$NEW_MASTER"; then
+                echo "  $1 — already derived, left alone ✅"
+            else
+                sed -i "s|^\(\s*$1\s*=\s*\)\"[^\"]*\"|\1\"$2\"|" "$NEW_MASTER"
+                echo "  $1 → $2 ✅"
+            fi
+        }
+        _mig_path TARGET_DIR "$DST"
+        _mig_path DATA_DIR   "$DST/data"
+        _mig_path STATE_DIR  "$DST/data/state"
+        unset -f _mig_path
     else
         error "master.conf not found at $NEW_MASTER"
         exit 1