Phase 1: resilient SSH handling + Push Conf button

partnership_onboard.sh (--phase1-only):
- Test if SSH already works first (BatchMode) — skip ssh-copy-id if yes
- If ssh-copy-id fails (no TTY in background): soft-fail, generate key locally,
  print pubkey for manual install, write HOST2_KEY_READY=true, run local setup
- Only skip conf push if SSH truly unavailable; otherwise proceeds normally
- Exit 0 with clear manual-step instructions instead of hard failure

include/partnership.php:
- Read HOST2_KEY_READY from setup.db; expose as key_ready on remote nodes

pages/partnership.php:
- Node card: amber "Key generated · install on HOST2 then Push Conf" badge
  when key_ready=true and phase=0
- "Push Conf (key installed)" button appears when key_ready=true — runs
  --phase1-only --skip-ssh (assumes user manually did ssh-copy-id)
- vvPtPushConf() top-level function

Plugin/unraid/include/partnership.php

@@ -156,6 +156,8 @@ function vv_pt_nodes(): array {
         $onboardPhase = $isMe ? null
             : (($setupDb[$nodeIdUpper . '_PHASE2_DONE'] ?? '') === 'true' ? 2
               : (($setupDb[$nodeIdUpper . '_PHASE1_DONE'] ?? '') === 'true' ? 1 : 0));
+        // key_ready: local key generated but not yet installed on HOST2 (SSH pending manual step)
+        $keyReady  = !$isMe && ($setupDb[$nodeIdUpper . '_KEY_READY'] ?? '') === 'true';
         // For self: local setup complete flag (set by partnership_manager --onboard --local-only)
         $localDone = $isMe && ($setupDb[$nodeIdUpper . '_LOCAL_DONE'] ?? '') === 'true';
 
@@ -172,6 +174,7 @@ function vv_pt_nodes(): array {
             'partnership'   => $ptDb,
             'system'        => $system,
             'onboard_phase' => $onboardPhase,
+            'key_ready'     => $keyReady,
             'local_done'    => $localDone,
         ];
     }