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/auth/reader.go

@@ -18,9 +18,8 @@ type sessionReaderImpl struct {
 	redisClient *redis.Client
 }
 
-// newSessionReader returns the concrete reader. Used by NewAuthService to
-// embed without going through the SessionReader interface (which would hide
-// redisClient from the rest of authServiceImpl).
+// Exposes the concrete type so authServiceImpl can embed it without
+// hiding redisClient behind the SessionReader interface.
 func newSessionReader(redisClient *redis.Client) *sessionReaderImpl {
 	return &sessionReaderImpl{redisClient: redisClient}
 }