Mobile notifications for iOS (#210)

* mobile: wire notification registration and listener

* implement backend components for push notifications

* refactor: agentic comment cleanup

* docs: use proper module name for particle processor

* set required env variables for push notifications

* bump version

* fix: always upsert push token on mobile start

* Revert "fix: always upsert push token on mobile start"

This reverts commit 90ff18a788.

* send push notifications regardless of online status

go/internal/network/service.go

@@ -28,7 +28,7 @@ var ErrInvalidRetentionHours = errors.New("message retention hours must be betwe
 type Service interface {
 	Reader
 
-	// Create creates a network and adds adminHumanId as the first member. Returns ErrInvalidName if name is empty.
+	// Create adds adminHumanId as the first member. Returns ErrInvalidName if name is empty.
 	Create(ctx context.Context, name, adminHumanId string) (*Network, error)
 	// SetName returns ErrNotFound or ErrInvalidName.
 	SetName(ctx context.Context, id, name string) error
@@ -145,10 +145,8 @@ func (s *serviceImpl) RemoveMember(ctx context.Context, networkID, humanId strin
 	return nil
 }
 
-// mirrorAddMembership / mirrorRemoveMembership keep the live store membership
-// projection (humans/{humanId}.networks) in sync with Postgres. Called after
-// the Postgres transaction commits. Failures are logged but not returned:
-// Postgres is the source of truth and the reconciler will heal drift.
+// Mirror the live store membership projection (humans/{humanId}.networks).
+// Postgres is the source of truth: failures are logged and the reconciler heals drift.
 func (s *serviceImpl) mirrorAddMembership(ctx context.Context, humanId, networkID string) {
 	if err := s.pub.Add(ctx, humanId, networkID); err != nil {
 		slog.Error("membership publish add failed", "error", err, "humanId", humanId, "networkID", networkID)
@@ -161,8 +159,7 @@ func (s *serviceImpl) mirrorRemoveMembership(ctx context.Context, humanId, netwo
 	}
 }
 
-// mutateMembers runs fn in a tx, recounts seats, calls billing.SyncSeats,
-// and commits. Any error rolls the membership change back.
+// Runs fn in a tx and syncs seats to billing atomically. Any error rolls back.
 func (s *serviceImpl) mutateMembers(ctx context.Context, networkID string, fn func(pgx.Tx) error) error {
 	tx, err := s.pool.Begin(ctx)
 	if err != nil {