Import the AVA2 drop items the server lacks as ordinary 40250 items

tools/server/ava2-items stages the 478 items referenced by the AVA2 drop
tables that 203 does not have: server item_proto/item_names rows, a client
item_proto/item_list/itemdesc patch over the biolog tables, and the AVA2
icons, ground models (BitKnit gr2 via sdk/gr2) and their textures, packed
as ava2items ahead of biolog. Materials, quest items, chests, the guardian
weapons and shoes keep their meaning; items of AVA2-only systems (pets,
pendants, new rings, mounts, sashes, costume enchants, talisman items, new
skill books) become plain ITEM_NONE items until those systems are ported.
Names are translated in names_zh.tsv.

item_proto_patch is the full-record successor of biolog_proto_patch, with
--dump for checking conversions against the shipped table.

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

tools/server/ava2-items/install_items.py

@@ -0,0 +1,18 @@
+#!/usr/bin/env python3
+"""Install items-server.tsv (from make_items.py) into share/conf/item_proto.txt + item_names.txt.
+Rows with the same vnum are replaced, so a rerun is idempotent. The db reads the tables only at boot:
+restart db and every core afterwards. Usage: install_items.py <server root> <items-server.tsv> <fresh backup dir>
+"""
+import shutil,sys
+from pathlib import Path
+server,rows,backup=map(Path,sys.argv[1:4])
+if backup.exists():raise SystemExit('use a fresh backup directory')
+items={int(l.split(b'\t',1)[0]):l for l in rows.read_bytes().splitlines() if l}
+backup.mkdir(parents=True)
+conf=server/'share/conf'
+for filename,row in (('item_proto.txt',lambda v:items[v]),('item_names.txt',lambda v:str(v).encode()+b'\t'+items[v].split(b'\t')[1])):
+    path=conf/filename;raw=path.read_bytes();shutil.copy2(path,backup/filename)
+    newline=b'\r\n' if b'\r\n' in raw else b'\n'
+    kept=[l for l in raw.replace(b'\r\n',b'\n').split(b'\n') if l and not (l.split(b'\t',1)[0].isdigit() and int(l.split(b'\t',1)[0]) in items)]
+    tmp=path.with_name(filename+'.tmp');tmp.write_bytes(newline.join(kept+[row(v) for v in sorted(items)])+newline);tmp.replace(path)
+print('AVA2 items installed:',len(items),'backup:',backup)