refactor: move unraid-specific tools into Plugin/unraid/tools/

api_cache_writer, remote_arr_cache_writer, conf_populate, storage_migrate are
all Unraid-adapter-specific — they read Docker appdata paths, Unraid service
configs, and drive the Unraid web plugin cache. They don't belong in Tools/.

- Tools/{4 scripts + php} → Plugin/unraid/tools/
- Fix source depth: ../ → ../../../ (now 3 levels from repo root)
- Fix conf_populate SCRIPTS_ROOT bug: was never set, would expand to empty
- api/arrs.php, api/storage.php: SCRIPTS_DIR/Tools/ → dirname(__DIR__)/tools/
- schedule.json: key IDs updated to Plugin/unraid/tools/...
- Cron rebuilt — live entries updated immediately

Plugin/unraid/tools/api_cache_writer.php

@@ -0,0 +1,56 @@
+<?php
+// API cache writer — runs every minute via Varaverk scheduler.
+// Builds monitor + arrs payloads and writes them to /tmp/vv_cache/ so page
+// loads can serve instantly from the file instead of making live HTTP calls.
+//
+// Called by api_cache_writer.sh (bash wrapper required by the scheduler).
+
+$_base = dirname(__DIR__) . '/Plugin/unraid';
+require_once $_base . '/include/monitor.php';
+require_once $_base . '/include/vms.php';
+require_once $_base . '/include/docker_folders.php';
+require_once $_base . '/include/arrs.php';
+
+$t = microtime(true);
+
+// ── Monitor payload ───────────────────────────────────────────────────────────
+// Call vv_api_data() once — result is static-cached for the rest of this process.
+vv_api_data();
+
+$monitor = [
+    'system'          => vv_system_info(),
+    'fallback'        => vv_fallback_state(),
+    'fallback_active' => vv_fallback_active(),
+    'partner'         => vv_partner_state(),
+    'resources'       => vv_system_resources(),
+    'cpu'             => vv_cpu_per_core(),
+    'mem'             => vv_memory_breakdown(),
+    'net'             => vv_network_stats(),
+    'gpu'             => vv_gpu_stats(),
+    'gpu_procs'       => vv_gpu_processes(),
+    'containers'      => vv_docker_containers(),
+    'stopped'         => vv_docker_stopped(),
+    'transcode'       => vv_transcode_sessions(),
+    'ups'             => vv_ups_stats(),
+    'parity'          => vv_parity_status(),
+    'storage'         => vv_storage_pools(),
+    'array_disks'     => vv_array_disks(),
+    'disk_io'         => vv_disk_io_rates(),
+    'watchdog'        => vv_watchdog_summary(),
+    'scripts'         => vv_scripts_status(),
+    'rsync'           => vv_rsync_status(),
+    'thresholds'      => vv_disk_thresholds(),
+    'vms'             => vv_get_vms(),
+    'docker_folders'  => vv_get_docker_folders(),
+    'remote_hosts'    => vv_remote_hosts_stats(),
+    '_api_status'     => vv_api_get_status(),
+    'ts'              => time(),
+];
+vv_cache_write('monitor', $monitor);
+
+// ── Arrs payload ──────────────────────────────────────────────────────────────
+$arrs = vv_arrs_all();
+vv_cache_write('arrs', $arrs);
+
+$elapsed = round((microtime(true) - $t) * 1000);
+echo "Cache written in {$elapsed}ms — monitor + arrs\n";