Remove Gorush, use direct APNs/FCM, fix worker queries

- Remove Gorush push server dependency (now using direct APNs/FCM)
- Update docker-compose.yml to remove gorush service
- Update config.go to remove GORUSH_URL
- Fix worker queries:
  - Use auth_user instead of user_user table
  - Use completed_at instead of completion_date column
- Add NotificationService to worker handler for actionable notifications
- Add docs/PUSH_NOTIFICATIONS.md with architecture documentation
- Update README.md, DOKKU_SETUP.md, and dev.sh

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

cmd/worker/main.go

@@ -13,6 +13,7 @@ import (
 	"github.com/treytartt/casera-api/internal/config"
 	"github.com/treytartt/casera-api/internal/database"
 	"github.com/treytartt/casera-api/internal/push"
+	"github.com/treytartt/casera-api/internal/repositories"
 	"github.com/treytartt/casera-api/internal/services"
 	"github.com/treytartt/casera-api/internal/worker/jobs"
 	"github.com/treytartt/casera-api/pkg/utils"
@@ -58,6 +59,11 @@ func main() {
 		log.Info().Str("host", cfg.Email.Host).Msg("Email service initialized")
 	}
 
+	// Initialize notification service for actionable push notifications
+	notificationRepo := repositories.NewNotificationRepository(db)
+	notificationService := services.NewNotificationService(notificationRepo, pushClient)
+	log.Info().Msg("Notification service initialized")
+
 	// Parse Redis URL for Asynq
 	redisOpt, err := asynq.ParseRedisURI(cfg.Redis.URL)
 	if err != nil {
@@ -85,7 +91,7 @@ func main() {
 	)
 
 	// Create job handler
-	jobHandler := jobs.NewHandler(db, pushClient, emailService, cfg)
+	jobHandler := jobs.NewHandler(db, pushClient, emailService, notificationService, cfg)
 
 	// Create Asynq mux and register handlers
 	mux := asynq.NewServeMux()