Chinese main menu: font atlas + GB2312 tables + Strings translation

- build_cjk.py: 2048x1024 UI atlas (original ASCII at 0,0 + full GB2312 at 12px) and
  cjk_glyph/cjk_metric tables.
- cn_strings.py + make_cn_strings.py: escape-aware GB2312 rewrite of Strings.dat (46 entries).
- install_cjk.py: one-shot deploy/restore (exe patch, atlas loose+res, strings).
- apply_cjk.py: fix metrics cave code byte order (was (second<<8)|first) so CJK width
  measures correctly and centred labels are no longer flushed right.
- docs: DEVLOG + patch notes for the atlas and the fix.

tools/make_cn_strings.py

@@ -0,0 +1,67 @@
+"""Patch the `English` column of `Data\\Misc\\Strings.dat` with simplified Chinese.
+
+Reads the byte-exact file (single byte code page), replaces only the value that
+follows `Id = "<id>"` and `English = "..."`, and writes GB2312 double byte text.
+The original is preserved next to it as `Strings.dat.orig` (once).
+"""
+
+import argparse
+import os
+import re
+import sys
+
+from cn_strings import CN_STRINGS
+
+DEFAULT_GAME = r"F:\steam\steamapps\common\The I of the Dragon"
+
+
+def patch(raw, mapping):
+    done, missing = [], []
+    for sid, cn in mapping.items():
+        enc = cn.encode("gb2312")
+        pat = re.compile(
+            rb'(Id\s*=\s*"' + re.escape(sid.encode("latin1")) + rb'"'
+            rb'\s*[\r\n]+\s*English\s*=\s*")(?:[^"\\]|\\.)*(")'
+        )
+        new, n = pat.subn(lambda m: m.group(1) + enc + m.group(2), raw, count=1)
+        if n:
+            raw = new
+            done.append(sid)
+        else:
+            missing.append(sid)
+    return raw, done, missing
+
+
+def main():
+    ap = argparse.ArgumentParser()
+    ap.add_argument("--game", default=DEFAULT_GAME)
+    ap.add_argument("--file", default=None)
+    ap.add_argument("--restore", action="store_true")
+    args = ap.parse_args()
+
+    path = args.file or os.path.join(args.game, "Data", "Misc", "Strings.dat")
+    bak = path + ".orig"
+
+    if args.restore:
+        if os.path.exists(bak):
+            open(path, "wb").write(open(bak, "rb").read())
+            print("restored", path)
+        else:
+            print("no backup at", bak)
+        return
+
+    if not os.path.exists(bak):
+        open(bak, "wb").write(open(path, "rb").read())
+        print("backup ->", bak)
+
+    raw = open(path, "rb").read()
+    out, done, missing = patch(raw, CN_STRINGS)
+    open(path, "wb").write(out)
+    print("patched %d/%d strings (%d bytes)" % (len(done), len(CN_STRINGS), len(out)))
+    if missing:
+        print("MISSING:", missing, file=sys.stderr)
+        sys.exit(2)
+
+
+if __name__ == "__main__":
+    main()