Add 小狩猎套装礼包: level-1 +9 set with full attributes, sold in the item mall

Server (tools/server/hunt-set, deployed on 203): game patch adds quest function
item.set_attribute (CItem::SetForceAttribute); quest hunt_set turns the unused
ITEM_QUEST 50307 into a per-class box of eight +9 pieces with five max-value
attributes each. Item mall sells it for 2,000,000.

Client locale: name overlay plus whole-row overlays for item_list.txt (gift-box
icon) and itemdesc.txt (build_zh_locale.py ROW_FILES).

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

data/zh_40250/item_list_zh_overlay.txt

@@ -0,0 +1,2 @@
+# vnum	type	icon[	model]: whole item_list.txt rows (build_zh_locale.py ROW_FILES)
+50307	ETC	icon/item/50035.tga