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).

Orchestrators/intermediate_sync_maintenance.sh

@@ -6,7 +6,7 @@
 # Schedule: 0 */4 * * * (every 4 hours)
 #
 # ── EXECUTION ORDER ───────────────────────────────────────────────────────────────────────────
-#   1. conf_sync.sh --pull-only    — refresh partner conf cache in RAM (/tmp/.vv/)
+#   1. conf_sync.sh --pull-only    — refresh partner conf cache in RAM (/tmp/.cache/vv/d/)
 #   2. arr_sync.sh                 — sync Lidarr/Sonarr/Radarr libraries across all nodes
 #   3. Rsync window (optional)     — INTERMEDIATE_SYNC_SHARES, if any configured
 #   4. INTERMEDIATE_MAINTENANCE_SCRIPTS — artwork fetch and any future 4-hour jobs