rename backend to core

.github/workflows/update-vendor-hash.yml

@@ -3,8 +3,8 @@ name: Update Vendor Hash
 on:
   push:
     paths:
-      - "backend/go.mod"
-      - "backend/go.sum"
+      - "core/go.mod"
+      - "core/go.sum"
     branches:
       - NOOP
 
@@ -20,13 +20,13 @@ jobs:
       - name: Install Nix
         uses: cachix/install-nix-action@v31
 
-      - name: Update vendorHash in backend/flake.nix
+      - name: Update vendorHash in core/flake.nix
         run: |
           set -euo pipefail
 
           # Try to build and capture the expected hash from error message
           echo "Attempting nix build to get new vendorHash..."
-          cd backend
+          cd core
           if output=$(nix build .#dms-cli 2>&1); then
             echo "Build succeeded, no hash update needed"
             exit 0
@@ -66,11 +66,11 @@ jobs:
         run: |
           set -euo pipefail
 
-          if ! git diff --quiet backend/flake.nix; then
+          if ! git diff --quiet core/flake.nix; then
             git config user.name "github-actions[bot]"
             git config user.email "github-actions[bot]@users.noreply.github.com"
 
-            git add backend/flake.nix
+            git add core/flake.nix
             git commit -m "flake: update vendorHash for go.mod changes"
 
             for attempt in 1 2 3; do
@@ -86,5 +86,5 @@ jobs:
             echo "Failed to push after retries" >&2
             exit 1
           else
-            echo "No changes to backend/flake.nix"
+            echo "No changes to core/flake.nix"
           fi