feat: enhance job and user models with additional fields

- Added VideoID, UserID, and TimeLimit fields to the job model.
- Removed unused referral fields from the user model.
- Updated job creation and update logic to handle new fields.
- Refactored job service to work with updated job model.
- Replaced cache interface with Redis adapter in service layer.
- Introduced a Dead Letter Queue (DLQ) for failed jobs in Redis.
- Updated gRPC server to accommodate changes in job handling.
- Removed obsolete cache package and related files.

pkg/cache/cache.go

@@ -1,14 +0,0 @@
-package cache
-
-import (
-	"context"
-	"time"
-)
-
-// Cache defines the interface for caching operations
-type Cache interface {
-	Set(ctx context.Context, key string, value interface{}, expiration time.Duration) error
-	Get(ctx context.Context, key string) (string, error)
-	Del(ctx context.Context, key string) error
-	Close() error
-}

pkg/cache/interface.go

@@ -1 +0,0 @@
-package cache

pkg/cache/redis.go

@@ -1,43 +0,0 @@
-package cache
-
-import (
-	"context"
-	"time"
-
-	"github.com/redis/go-redis/v9"
-)
-
-type redisCache struct {
-	client *redis.Client
-}
-
-// NewRedisCache creates a new instance of Redis cache implementing Cache interface
-func NewRedisCache(addr, password string, db int) (Cache, error) {
-	rdb := redis.NewClient(&redis.Options{
-		Addr:     addr,
-		Password: password,
-		DB:       db,
-	})
-
-	if err := rdb.Ping(context.Background()).Err(); err != nil {
-		return nil, err
-	}
-
-	return &redisCache{client: rdb}, nil
-}
-
-func (c *redisCache) Set(ctx context.Context, key string, value interface{}, expiration time.Duration) error {
-	return c.client.Set(ctx, key, value, expiration).Err()
-}
-
-func (c *redisCache) Get(ctx context.Context, key string) (string, error) {
-	return c.client.Get(ctx, key).Result()
-}
-
-func (c *redisCache) Del(ctx context.Context, key string) error {
-	return c.client.Del(ctx, key).Err()
-}
-
-func (c *redisCache) Close() error {
-	return c.client.Close()
-}