Platform-agnostic refactor: eliminate OS-specific hardcodes from core scripts

All bash scripts are now platform-neutral. Unraid-specific paths, commands,
and service checks moved to Plugin/unraid/adapter.sh. Core scripts call
platform_*() functions exclusively — no direct OS paths in runtime logic.

New adapter functions: platform_storage_path, platform_webui_install_path,
platform_scripts_dir_probe_cmd, platform_setup_db_path, platform_storage_healthy,
platform_is_service_enabled, platform_get_temp_thresholds, platform_disk_states_path,
platform_rebuild_container, platform_push_conf, platform_push_setup_state,
platform_get_templates_dir, platform_send_os_notification.

Partnership services stack (Emby/Jellyfin/Seerr/SeerrFin) added as third
onboarding stack alongside auth and arr stacks.

System_Essentials/clear_logs.sh

@@ -93,10 +93,6 @@ if [[ "$EUID" -ne 0 ]]; then
     exit 1
 fi
 
-platform_require_cmd \
-    "/usr/local/emhttp/plugins/dynamix/scripts/notify" \
-    "" "" \
-    "unRAID notify script" || warn "unRAID notify script not found — native notifications disabled"
 
 acquire_lock
 

System_Essentials/conf_sync.sh

@@ -100,7 +100,7 @@ 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 [[ "$PUSH_ONLY" == false ]]; then
-        remote_conf="/boot/config/plugins/varaverk/Configurations/${partner_slot}.conf"
+        remote_conf="${SCRIPTS_DIR}/Configurations/${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" \

System_Essentials/docker_syslog_filter.sh

@@ -93,10 +93,6 @@ if [[ "$EUID" -ne 0 ]]; then
     exit 1
 fi
 
-platform_require_cmd \
-    "/usr/local/emhttp/plugins/dynamix/scripts/notify" \
-    "" "" \
-    "unRAID notify script" || warn "unRAID notify script not found — native notifications disabled"
 
 acquire_lock
 

System_Essentials/inotify_tuning.sh

@@ -99,10 +99,6 @@ if [[ "$EUID" -ne 0 ]]; then
     exit 1
 fi
 
-platform_require_cmd \
-    "/usr/local/emhttp/plugins/dynamix/scripts/notify" \
-    "" "" \
-    "unRAID notify script" || warn "unRAID notify script not found — native notifications disabled"
 
 acquire_lock
 

System_Essentials/rsync_stop.sh

@@ -114,10 +114,6 @@ if [[ "$EUID" -ne 0 ]]; then
     exit 1
 fi
 
-platform_require_cmd \
-    "/usr/local/emhttp/plugins/dynamix/scripts/notify" \
-    "" "" \
-    "unRAID notify script" || warn "unRAID notify script not found — native notifications disabled"
 
 acquire_lock
 

System_Essentials/server_reboot.sh

@@ -110,10 +110,6 @@ if [[ "$EUID" -ne 0 ]]; then
     exit 1
 fi
 
-platform_require_cmd \
-    "/usr/local/emhttp/plugins/dynamix/scripts/notify" \
-    "" "" \
-    "unRAID notify script" || warn "unRAID notify script not found — native notifications disabled"
 
 validate_int REBOOT_SLEEP "$REBOOT_SLEEP"