fix(nodes): let a master's push and reconcile converge node inbounds

Invariant: every inbound the master holds for a node, with its clients and
enable flag, converges onto that node at the next push or reconcile.

823db059 made an inbound save keep the stored clients and enable unless the
request is a master push, recognised only by a node-sync token scope. Nodes
are usually enrolled with an admin token (the -getApiToken and install
default), so their nodes treated every master push as a stale form save:
clients attached on the master (Attach existing clients, bulk attach above
the per-client threshold, any dirty-node reconcile) never reached the node,
yet the push was recorded as successful so reconcile stopped retrying.
Remote now marks every request with X-3x-Master-Push, and the node honours
it like the node-sync scope. The browser form never sends it, so the
stale-form protection for panel saves and plain API scripts is unchanged.

Separately, an inbound deleted on the node kept its tag->id in the
master's cache, so reconcile sent update/<deleted id> forever instead of
re-creating it. When the node reports no form of the tag, ReconcileInbound
now drops the cached id so the resolve re-reads the node and falls back to
add. Two runtime tests pinned the old update-to-cached-id path for an
absent inbound; they now count the add, or report the inbound present.

internal/web/runtime/remote.go

@@ -237,6 +237,7 @@ func (r *Remote) do(ctx context.Context, method, path string, body any) (*envelo
 		req.Header.Set("Authorization", "Bearer "+token)
 	}
 	req.Header.Set("Accept", "application/json")
+	req.Header.Set(wirecodec.MasterPushHeader, "1")
 	if contentType != "" {
 		req.Header.Set("Content-Type", contentType)
 	}
@@ -359,6 +360,15 @@ func (r *Remote) cacheDel(tag string) {
 	delete(r.pushedFP, tag)
 }
 
+// forgetTag drops every tag form cacheGetTag would match, once the node reports
+// none of them, so the next resolve re-reads the node instead of a deleted id.
+func (r *Remote) forgetTag(tag string) {
+	prefix := nodeInboundTagPrefix(r.node.Id)
+	bare := strings.TrimPrefix(tag, prefix)
+	r.cacheDel(bare)
+	r.cacheDel(prefix + bare)
+}
+
 func (r *Remote) ListRemoteTags(ctx context.Context) ([]string, error) {
 	if err := r.refreshRemoteIDs(ctx); err != nil {
 		return nil, err
@@ -494,6 +504,8 @@ func (r *Remote) ReconcileInbound(ctx context.Context, ib *model.Inbound, exists
 		if ok && prev == fp {
 			return false, nil
 		}
+	} else {
+		r.forgetTag(ib.Tag)
 	}
 	if err := r.UpdateInbound(ctx, ib, ib); err != nil {
 		return false, err