backend apis updation

.gitattributes

@@ -0,0 +1,22 @@
+# Line endings, pinned so they do not depend on each developer's Git config.
+#
+# Git for Windows ships core.autocrlf=true in its system gitconfig, which
+# stores LF but checks out CRLF - the source of the "LF will be replaced by
+# CRLF" warnings on `git add`. Declaring the policy here overrides that for
+# everyone, so Windows, Linux and the Docker build all agree.
+#
+# The repository is already entirely LF (`git ls-files --eol` shows i/lf
+# across the board), so eol=lf pins the working tree to what the index
+# already holds and rewrites no committed content.
+* text=auto eol=lf
+
+# Binaries must never be EOL-converted - a substituted byte corrupts them.
+# Git already auto-detects these; saying so explicitly means a future edit
+# to the wildcard above cannot silently start mangling them.
+*.joblib binary
+*.db     binary
+
+# Windows-only scripts genuinely need CRLF. None are tracked in this repo
+# today (start_app.bat lives above it), but the rule belongs with the policy.
+*.bat text eol=crlf
+*.ps1 text eol=crlf