Make seeding Phase 3 — its own operator-triggered phase, not the tail of an onboard

Onboard now ends at Phase 2: connected, running, and saying so. Phase 3 sets the seeding gate posture and dispatches the seed. With MEDIA_SEED_ENABLED false there is no Phase 3 and the model is two phases.

Plugin/unraid/include/partnership.php

@@ -242,7 +242,7 @@ function vv_pt_remote_system(string $ip, string $sshKey): array {
 //
 // Returns [] when there has never been a seed. A stale "running" record whose pid is gone is
 // reported as stopped rather than running: a record is not a process.
-function vv_pt_media_seed(): array {
+function vv_pt_media_seed(array $setupDb = [], string $nodeIdUpper = ''): array {
     $stat = '/var/log/varaverk/Rsync/media_seed.json';
     $log  = '/var/log/varaverk/Rsync/media_seed.log';
 
@@ -257,10 +257,16 @@ function vv_pt_media_seed(): array {
     $toggle  = vv_arr_scalar($raw, 'MEDIA_SEED_ENABLED');
     $enabled = ($toggle === '' || strtolower($toggle) === 'true');
 
-    if (!is_file($stat)) return ['enabled' => $enabled];
+    // Phase 3 is complete only when every share landed, which media_seed.sh decides and records
+    // at the end of a run that may have taken weeks. The job record cannot answer this: it goes
+    // "ok" the moment the process exits, including the exits that seeded nothing.
+    $phase3Done = $nodeIdUpper !== ''
+        && ($setupDb[$nodeIdUpper . '_PHASE3_DONE'] ?? '') === 'true';
+
+    if (!is_file($stat)) return ['enabled' => $enabled, 'phase3_done' => $phase3Done];
 
     $j = json_decode((string)file_get_contents($stat), true);
-    if (!is_array($j)) return ['enabled' => $enabled];
+    if (!is_array($j)) return ['enabled' => $enabled, 'phase3_done' => $phase3Done];
 
     $status = (string)($j['status'] ?? '');
     $pid    = (int)($j['pid'] ?? 0);
@@ -292,7 +298,8 @@ function vv_pt_media_seed(): array {
     }
 
     return array_filter([
-        'enabled' => $enabled,
+        'enabled'     => $enabled,
+        'phase3_done' => $phase3Done,
         'status'  => $status,
         'start'   => isset($j['start']) ? (int)$j['start'] : null,
         'end'     => isset($j['end'])   ? (int)$j['end']   : null,
@@ -433,7 +440,7 @@ function vv_pt_nodes(): array {
             'api_key_set'     => $apiKeySet,
             'api_key_preview' => $apiKeyPreview,
             'metrics'         => $metrics,
-            'media_seed'      => $isMe ? [] : vv_pt_media_seed(),
+            'media_seed'      => $isMe ? [] : vv_pt_media_seed($setupDb, $nodeIdUpper),
         ];
     }
     return $nodes;