Storage-mode awareness pass + doc update for System_Essentials through Partnership

All state/data file paths in scripts and PHP now resolve via STATE_DIR / DATA_DIR /
PERSISTENT_CONF_CACHE instead of hardcoded /boot/config/ or /tmp/ paths, so the
ecosystem works in both internal and appdata storage modes.

PHP layer (watchdog.php, partnership.php, fallback.php, monitor.php, snapshot.php,
config.php): all state reads switched to STATE_DIR constant; remote state reads use
the new vv_remote_state_cmd() helper which resolves the remote's SCRIPTS_DIR via
their varaverk.cfg before building the path.

conf_sync.sh: fixed SCRIPTS_ROOT → SCRIPTS_DIR bug on MY_CONF path; added
_remote_scripts_dir() to resolve partner's SCRIPTS_DIR before SCP pull.

fallback.php page: added controls card (PARTNERSHIP_ENABLED, FALLBACK_ENABLED,
FALLBACK_RSYNC_ENABLED toggles), status grid, and settings card.

README and Manual updated for System_Essentials, Watchdogs, Fallback, Rsync,
Media, Monitors, Orchestrators, Partnership: added new scripts (conf_sync,
conf_cache_save/restore, conf_cache_watchdog, play_state_sync, start_webhook_listener,
upgrade_webhook_handler), corrected all stale /boot/config/ state file paths to
$STATE_DIR/$DATA_DIR, noted webgui/php_fpm/mover/user_scripts scripts moved to
Plugin/unraid/System_Essentials, fixed start_webhook_listener.sh header (Node.js,
not PHP -S).

System_Essentials/conf_sync.sh

@@ -11,15 +11,18 @@
 # On array start (default / --array-start):
 #   1. Copy own conf to local cache
 #   2. Pull each available partner's conf from their disk → local cache
-#   3. Push own conf to each available partner's /tmp/.vv/ cache
+#   3. Push own conf to each available partner's /tmp/.cache/vv/d/ cache
 #
 # On conf save (--push-only):
-#   Fast path — push updated own conf to all partners' /tmp/.vv/ cache only.
+#   Fast path — push updated own conf to all partners' /tmp/.cache/vv/d/ only.
 #   No pulls, no local cache rebuild.
 #
-# Cache is /tmp (tmpfs) — cleared every reboot, repopulated by this script
-# on next array start. Scripts source from cache for partner vars; own vars
-# always come from disk (load_config.sh skips cached copy of own conf).
+# Cache is /tmp/.cache/vv/d (tmpfs) — cleared every reboot, repopulated by
+# this script on next array start. Scripts source from cache for partner vars;
+# own vars always come from disk (load_config.sh skips cached copy of own conf).
+#
+# Pull path resolves the remote's SCRIPTS_DIR from their varaverk.cfg so it
+# works whether the remote is in internal or appdata storage mode.
 #
 # ==============================================================================================
 # RUNTIME MODES
@@ -56,9 +59,25 @@ if [[ "${CONF_SYNC_ENABLED:-true}" == false ]]; then
 fi
 
 CACHE_DIR="/tmp/.cache/vv/d"
-MY_CONF="$SCRIPTS_ROOT/Configurations/${MY_ID,,}.conf"
+MY_CONF="$SCRIPTS_DIR/Configurations/${MY_ID,,}.conf"
 SSH_TIMEOUT=10
 
+# Reads the remote's varaverk.cfg to find their actual SCRIPTS_DIR.
+# Handles the case where the remote is in appdata storage mode.
+_remote_scripts_dir() {
+    local ip="$1"
+    local cfg line sd
+    cfg=$(timeout "$SSH_TIMEOUT" ssh -i "$SSH_KEY" \
+        -o ConnectTimeout="$SSH_TIMEOUT" -o BatchMode=yes -o StrictHostKeyChecking=no \
+        "root@${ip}" "cat /boot/config/plugins/varaverk/varaverk.cfg 2>/dev/null" 2>/dev/null) || true
+    while IFS= read -r line; do
+        [[ "$line" == SCRIPTS_DIR=* ]] || continue
+        sd="${line#SCRIPTS_DIR=}"; sd="${sd//\"/}"; sd="${sd//\'/}"
+        echo "$sd"; return
+    done <<< "$cfg"
+    echo "/boot/config/plugins/varaverk"
+}
+
 [[ "$DRY_RUN" == true ]] && warn "DRY RUN — no changes will be made"
 
 # ── Ensure cache dir exists ───────────────────────────────────────────────────
@@ -101,7 +120,8 @@ for host_var in $(compgen -v | grep -E '^HOST[0-9]+$' | sort); do
 
     # ── Pull: grab partner's conf from their disk → our local cache ──────────
     if [[ "$PUSH_ONLY" == false ]]; then
-        remote_conf="${SCRIPTS_DIR}/Configurations/${partner_slot}.conf"
+        remote_sd=$(_remote_scripts_dir "$partner_ip")
+        remote_conf="${remote_sd}/Configurations/${partner_slot}.conf"
         if [[ "$DRY_RUN" == true ]]; then
             warn "DRY RUN — would pull $partner_host:$remote_conf → $CACHE_DIR/${partner_slot}.conf"
         elif timeout "$SSH_TIMEOUT" scp -i "$SSH_KEY" \
@@ -116,7 +136,7 @@ for host_var in $(compgen -v | grep -E '^HOST[0-9]+$' | sort); do
         fi
     fi
 
-    # ── Push: send own conf to partner's /tmp/.vv/ cache ────────────────────
+    # ── Push: send own conf to partner's /tmp/.cache/vv/d/ cache ───────────
     if [[ "$PULL_ONLY" == true ]]; then
         continue
     fi