Add Dependabot tracking for bnf/ package (#73)

* Initial plan

* Add Dependabot tracking for bnf/ package (npm and uv)

Co-authored-by: hzhangxyz <11623447+hzhangxyz@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: hzhangxyz <11623447+hzhangxyz@users.noreply.github.com>

Author: Copilot

.github/dependabot.yml

@@ -11,7 +11,17 @@ updates:
     schedule:
       interval: "weekly"
 
+  - package-ecosystem: "npm"
+    directory: "/bnf"
+    schedule:
+      interval: "weekly"
+
   - package-ecosystem: "uv"
     directory: "/"
     schedule:
       interval: "weekly"
+
+  - package-ecosystem: "uv"
+    directory: "/bnf"
+    schedule:
+      interval: "weekly"