Consolidate all paths to plugin flash dir, fix watchdog 7.3 triggers

- Move SCRIPTS_DIR/DATA_DIR/STATE_DIR from appdata to /boot/config/plugins/varaverk
- All state files now in STATE_DIR (no more /tmp or /boot/config root writes)
- Bootstrap: Gitea-first clone with GitHub fallback, no array dependency
- varaverk.cfg seeded with Gitea connection settings
- .gitignore: add State_Files/, varaverk.cfg, varaverk-*.txz
- Partnership/transcode/fallback scripts use STATE_DIR variables
- PHP config.php: DATA_DIR/STATE_DIR constants, VV_SETUP_STATE_FILE dynamic
- deploy.sh PROD_ROOT updated to plugin flash dir

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Plugin/unraid/api/partnership_ping.php

@@ -0,0 +1,14 @@
+<?php
+// Connectivity test — SSH echo to a partner host with round-trip latency.
+// GET ?id=HOST2  (GET avoids the bodyless-POST issue on this nginx setup).
+header('Content-Type: application/json');
+header('Cache-Control: no-store, no-cache');
+require_once dirname(__DIR__) . '/include/partnership.php';
+
+$id = trim($_GET['id'] ?? '');
+if (!preg_match('/^host\d+$/i', $id)) {
+    echo json_encode(['ok' => false, 'error' => 'Invalid host id']);
+    exit;
+}
+
+echo json_encode(vv_pt_ping($id));