Resolve remote storage path from host*.conf for true cross-platform SSH support

detect_hosts() now sets REMOTE_STORAGE_PATH from HOST*_STORAGE_PATH in the
remote's conf instead of calling platform_storage_path() locally. SSH commands
that check the remote's storage (check_remote_array, check_remote_disks,
check_both_healthy) use $REMOTE_STORAGE_PATH so they work correctly when the
remote is a different platform with a different storage root.

Partnership/partnership_manager.sh

@@ -876,14 +876,13 @@ revoke_emby_admin() {
 check_both_healthy() {
     platform_storage_healthy || { error "Local array not healthy"; return 1; }
 
-    local mirror_ip _spath
+    local mirror_ip
     mirror_ip=$(resolve_tailscale_ip "$MIRROR")
     [[ -z "$mirror_ip" ]] && { error "Cannot resolve $MIRROR Tailscale IP"; return 1; }
-    _spath=$(platform_storage_path)
 
     timeout "$SSH_TIMEOUT" ssh -i "$MIRROR_SSH_KEY" \
         -o ConnectTimeout="$SSH_TIMEOUT" root@"$mirror_ip" \
-        "mountpoint -q '$_spath' && timeout 10 docker ps" >/dev/null 2>&1 || {
+        "mountpoint -q '$REMOTE_STORAGE_PATH' && timeout 10 docker ps" >/dev/null 2>&1 || {
         error "Mirror $MIRROR not healthy"
         return 1
     }

common.sh

@@ -362,11 +362,13 @@ validate_int() {
 # all HOST* values discovered from host*.conf files.
 #
 # Sets:
-#   MY_ID              — "HOST1" or "HOST2" (the role key, not the hostname)
+#   MY_ID               — "HOST1" or "HOST2" (the role key, not the hostname)
-#   REMOTE_ID          — the peer's role key
+#   REMOTE_ID           — the peer's role key
-#   LOCAL_SERVER_NAME  — local hostname string (e.g. "unRAID-Gmer4Lfe")
+#   LOCAL_SERVER_NAME   — local hostname string (e.g. "unRAID-Gmer4Lfe")
-#   REMOTE_SERVER_NAME — remote hostname string
+#   REMOTE_SERVER_NAME  — remote hostname string
-#   SSH_KEY            — SSH key for server-to-server operations
+#   SSH_KEY             — SSH key for server-to-server operations
+#   REMOTE_STORAGE_PATH — remote's storage root from HOST*_STORAGE_PATH in host*.conf;
+#                         falls back to platform_storage_path() for unconfigured pairs
 #
 # Also sets aliases for all host-specific arrays so scripts use unprefixed names:
 #   DAILY_SYNC_SHARES         ← HOST*_DAILY_SYNC_SHARES
@@ -609,6 +611,13 @@ detect_hosts() {
     _alias_assoc "WATCHDOG_DEPENDENCIES"
     _alias_assoc "WATCHDOG_APPDATA_SIZES"
 
+    # ── Remote storage path ───────────────────────────────────────────────────
+    # Resolved from REMOTE_ID's host*.conf so SSH commands use the correct path
+    # even when the remote is a different platform. Falls back to the local
+    # platform_storage_path() for unconfigured same-platform pairs.
+    local _rsp_var="${REMOTE_ID}_STORAGE_PATH"
+    REMOTE_STORAGE_PATH="${!_rsp_var:-$(platform_storage_path)}"
+
     # ── Output ────────────────────────────────────────────────────────────────
     log "$ICON_HOST Host: $LOCAL_SERVER_NAME → $REMOTE_SERVER_NAME"
 }
@@ -773,7 +782,7 @@ check_local_array() {
 check_remote_array() {
     log "Checking remote array on $REMOTE_SERVER_NAME..."
     local _spath result
-    _spath=$(platform_storage_path)
+    _spath="$REMOTE_STORAGE_PATH"
     result=$(ssh -i "$SSH_KEY" -o ConnectTimeout=10 root@"$REMOTE_SERVER" \
         "mountpoint -q '$_spath' && echo yes || echo no" 2>/dev/null)
     if [[ "$result" != "yes" ]]; then
@@ -1000,8 +1009,7 @@ check_remote_disks() {
         done | sort -u" 2>/dev/null)
 
     # Tier 3 — storage root fallback
-    local _spath
+    local _spath="$REMOTE_STORAGE_PATH"
-    _spath=$(platform_storage_path)
     if [[ -z "$backing_disks" ]] && [[ -z "$zfs_pool_paths" ]]; then
         local on_user
         on_user=$(ssh -i "$SSH_KEY" root@"$REMOTE_SERVER" \