Revert "feat(loyalty): EnakPoint & EnakCoin" (#32)

This reverts merge commit 645da30, returning main to f0ff59f.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

internal/service/earning_backfill_job.go

@@ -1,74 +0,0 @@
-package service
-
-import (
-	"context"
-	"sync"
-	"time"
-
-	"apskel-pos-be/internal/logger"
-)
-
-const (
-	defaultEarningBackfillInterval = 30 * time.Minute
-	// How far back to look for paid orders that never earned.
-	earningBackfillWindow = 72 * time.Hour
-	// Orders looked at per run at most, so one run cannot run away.
-	earningBackfillMaxOrders = 5000
-)
-
-type missingEarner interface {
-	EarnMissing(ctx context.Context, since time.Time, maxOrders int) (checked, earned int, err error)
-}
-
-// EarningBackfillJob is the safety net behind earning at payment time
-// (docs/prd-point-coin.md F3, PC-203). Every run it earns for orders paid in the last
-// few days that should have earned and did not, for example because the database was
-// briefly unreachable right after the payment committed.
-type EarningBackfillJob struct {
-	earner   missingEarner
-	now      func() time.Time
-	stopCh   chan struct{}
-	stopOnce sync.Once
-}
-
-func NewEarningBackfillJob(earner missingEarner) *EarningBackfillJob {
-	return &EarningBackfillJob{earner: earner, now: time.Now, stopCh: make(chan struct{})}
-}
-
-func (j *EarningBackfillJob) Start(interval time.Duration) {
-	if interval <= 0 {
-		interval = defaultEarningBackfillInterval
-	}
-	go func() {
-		j.RunOnce(context.Background())
-		ticker := time.NewTicker(interval)
-		defer ticker.Stop()
-		for {
-			select {
-			case <-ticker.C:
-				j.RunOnce(context.Background())
-			case <-j.stopCh:
-				return
-			}
-		}
-	}()
-	logger.NonContext.Infof("Earning backfill job started (interval: %s)", interval)
-}
-
-func (j *EarningBackfillJob) Stop() {
-	j.stopOnce.Do(func() { close(j.stopCh) })
-}
-
-// RunOnce earns for every missed order in the window and reports how many it fixed.
-// It is quiet when nothing was missed.
-func (j *EarningBackfillJob) RunOnce(ctx context.Context) int {
-	checked, earned, err := j.earner.EarnMissing(ctx, j.now().Add(-earningBackfillWindow), earningBackfillMaxOrders)
-	if err != nil {
-		logger.NonContext.Error("Earning backfill failed to run", err)
-	}
-	if earned > 0 {
-		logger.NonContext.WarnWithFields("Earning backfill credited orders that had missed their earning",
-			map[string]interface{}{"checked": checked, "earned": earned}, nil)
-	}
-	return earned
-}