feat: use sqlite for jikan api cache with hourly cleanup

internal/database/models.go

@@ -35,6 +35,13 @@ type AnimeRelation struct {
 	RelationType   string `json:"relation_type"`
 }
 
+type JikanCache struct {
+	Key       string    `json:"key"`
+	Data      string    `json:"data"`
+	ExpiresAt time.Time `json:"expires_at"`
+	CreatedAt time.Time `json:"created_at"`
+}
+
 type NotificationPreference struct {
 	ID                string    `json:"id"`
 	UserID            string    `json:"user_id"`