chore: ignore local-only debug + packaging artefacts

build.log, config.txt, PMServer.rar, quickunlock.bin, vault copies and
screenshot drops were cluttering `git status`. None of these belong in
the repo: build/config/rar are per-machine, quickunlock.bin is a DPAPI
blob bound to the dev user's Windows account, vault copies are personal
data, screenshots are scratch.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

.gitignore

@@ -39,3 +39,20 @@ pm-debug.log
 
 # Asset build log (regenerated by BuildAssets.cmd/ps1)
 delphi-backend/assets/build.log
+
+# Local-only debug / packaging artefacts next to the exe.
+delphi-backend/build.log
+delphi-backend/config.txt
+delphi-backend/PMServer.rar
+
+# Quick-unlock DPAPI blob — device-bound, MUST NOT be committed.
+delphi-backend/quickunlock.bin
+
+# Vault backup copies users keep next to the exe while testing.
+delphi-backend/vault*.db
+delphi-backend/vault - Copie*.db
+
+# Screenshots / scratch images dropped in the repo root during dev.
+*.png
+*.jpg
+*.jpeg