Strip IDE cruft, stale build binaries, and dead source copies before external push

Removes Visual Studio local-state files (.vs/, .vcxproj.user, .suo/.VC.db),
precompiled Windows server binaries (now built from source via Docker), and
"Copy of"/.bak duplicate source/data files that were never referenced by the
CMake build. Adds matching .gitignore rules so they don't come back.

.gitignore

@@ -3,11 +3,29 @@ build-*/
 .env
 
 # Windows game client + data assets, kept locally for end-to-end login/game
-# testing but not part of the server source tree.
+# testing but not part of the server source tree. Binary/3DData is the
+# separate, already-pruned subset of this data the server itself actually
+# reads (STB definitions, quest scripts, AIP scripts) and stays tracked.
 /Client/
 /3Ddata/
 /3Ddata.zip
 /KTRose_pre-evo.zip
 
+# Visual Studio / MSVC local IDE state -- machine-specific, never useful to
+# another checkout.
+.vs/
+*.vcxproj.user
+*.suo
+*.ncb
+*.sdf
+*.VC.db
+
+# Editor/OS cruft and stray backup files left by past edits.
+*.bak
+*~
+[Cc]opy of *
+Thumbs.db
+.DS_Store
+
 # Claude Code project-local config
 /.claude/