fix(admin): resolve moderation, gift, and admin-panel bugs from QA

- scam/fake: enforce mutual exclusivity (scam precedence) at TL conversion, admin command, and UI toggles; both flags could render as neither
- scam/fake flicker: persist scam/fake in the Redis user base cache so cache hits no longer drop the flags
- getSavedStarGifts: hidden (unsaved) gifts are now force-excluded for non-owner viewers; same guard for get-by-ref
- convertStarGift: map already-upgraded/owner-invalid/unavailable to a clean client error instead of 500
- channel force-settings: send only changed fields (partial patch) and re-sync toggles after reload, so one setting no longer resets another
- give gifts: removed custom collectible numbers (auto sequential only); locked sender to the system account 777000
- give gifts UI: fixed picker card spacing/right gap; static (hover-play) Lottie previews on emoji + picker to stop render lag; fixed emoji ID field overflow

internal/store/postgres/star_gift_upgrade.go

@@ -164,19 +164,6 @@ WHERE collectible_revision_id=$1 AND crafted
 			}
 
 			num := revision.Issued + 1
-			if req.Num > 0 {
-				if req.Num > revision.SupplyTotal {
-					return domain.ErrStarGiftCollectibleInvalid
-				}
-				var numTaken bool
-				if err := tx.QueryRow(ctx, `SELECT EXISTS (SELECT 1 FROM unique_star_gifts WHERE gift_id=$1 AND num=$2)`, locked.GiftID, req.Num).Scan(&numTaken); err != nil {
-					return fmt.Errorf("check collectible number availability: %w", err)
-				}
-				if numTaken {
-					return domain.ErrStarGiftCollectibleNumberTaken
-				}
-				num = req.Num
-			}
 			var uniqueID int64
 			if err := tx.QueryRow(ctx, `SELECT nextval('unique_star_gift_id_seq')`).Scan(&uniqueID); err != nil {
 				return fmt.Errorf("allocate unique star gift id: %w", err)