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/depot/models.go

@@ -2,7 +2,6 @@ package depot
 
 import "time"
 
-// Object represents a stored object in the depot
 type Object struct {
 	ID              string
 	Name            string
@@ -14,31 +13,26 @@ type Object struct {
 	CreatedAt       time.Time
 }
 
-// PrepareUploadInput represents the input for preparing an upload
 type PrepareUploadInput struct {
-	Prefix        string // Optional prefix for organizing objects (e.g., network_id)
+	Prefix        string // optional, e.g. network_id
 	Name          string
 	ContentType   string
 	ContentLength int64
 }
 
-// PrepareUploadResult represents the result of preparing an upload
 type PrepareUploadResult struct {
 	ObjectID      string
 	UploadURL     string
 	UploadHeaders map[string]string
 }
 
-// CreateFromReaderInput is for server-side direct uploads (no presigned URL).
-// Used by background workers that already have the bytes on hand and don't
-// need a client round-trip.
+// For server-side direct uploads (no presigned URL).
 type CreateFromReaderInput struct {
-	Prefix      string // Optional prefix for organizing objects (e.g., network_id)
+	Prefix      string // optional, e.g. network_id
 	Name        string
 	ContentType string
 }
 
-// Config holds configuration for the depot service
 type Config struct {
 	GoogleServiceAccountEmail string
 	BucketName                string