Move @backstage/backend-defaults to devDependencies in backend plugins

Move @backstage/backend-defaults from dependencies to devDependencies
in all backend plugins that had it as a production dependency. None of
these plugins use it in their production source code - it's only needed
for dev servers (dev/index.ts) and test files.

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>
Co-authored-by: Cursor <cursoragent@cursor.com>

.changeset/remove-backend-defaults-from-plugins.md

@@ -0,0 +1,10 @@
+---
+'@backstage/plugin-devtools-backend': patch
+'@backstage/plugin-mcp-actions-backend': patch
+'@backstage/plugin-scaffolder-backend': patch
+'@backstage/plugin-search-backend': patch
+'@backstage/plugin-techdocs-backend': patch
+'@backstage/plugin-user-settings-backend': patch
+---
+
+Moved `@backstage/backend-defaults` from `dependencies` to `devDependencies`.

plugins/devtools-backend/package.json

@@ -39,7 +39,6 @@
     "test": "backstage-cli package test"
   },
   "dependencies": {
-    "@backstage/backend-defaults": "workspace:^",
     "@backstage/backend-plugin-api": "workspace:^",
     "@backstage/cli-common": "workspace:^",
     "@backstage/config": "workspace:^",

plugins/mcp-actions-backend/package.json

@@ -34,7 +34,6 @@
     "test": "backstage-cli package test"
   },
   "dependencies": {
-    "@backstage/backend-defaults": "workspace:^",
     "@backstage/backend-plugin-api": "workspace:^",
     "@backstage/catalog-client": "workspace:^",
     "@backstage/errors": "workspace:^",
@@ -47,6 +46,7 @@
     "zod": "^3.25.76"
   },
   "devDependencies": {
+    "@backstage/backend-defaults": "workspace:^",
     "@backstage/backend-test-utils": "workspace:^",
     "@backstage/cli": "workspace:^",
     "@types/express": "^4.17.6"

plugins/scaffolder-backend/package.json

@@ -65,7 +65,6 @@
     "test": "backstage-cli package test"
   },
   "dependencies": {
-    "@backstage/backend-defaults": "workspace:^",
     "@backstage/backend-openapi-utils": "workspace:^",
     "@backstage/backend-plugin-api": "workspace:^",
     "@backstage/catalog-model": "workspace:^",

plugins/search-backend/package.json

@@ -56,7 +56,6 @@
     "test": "backstage-cli package test"
   },
   "dependencies": {
-    "@backstage/backend-defaults": "workspace:^",
     "@backstage/backend-openapi-utils": "workspace:^",
     "@backstage/backend-plugin-api": "workspace:^",
     "@backstage/config": "workspace:^",
@@ -74,6 +73,7 @@
     "zod": "^3.25.76"
   },
   "devDependencies": {
+    "@backstage/backend-defaults": "workspace:^",
     "@backstage/backend-test-utils": "workspace:^",
     "@backstage/cli": "workspace:^",
     "@backstage/repo-tools": "workspace:^",

plugins/techdocs-backend/package.json

@@ -61,7 +61,6 @@
     "test": "backstage-cli package test"
   },
   "dependencies": {
-    "@backstage/backend-defaults": "workspace:^",
     "@backstage/backend-plugin-api": "workspace:^",
     "@backstage/catalog-client": "workspace:^",
     "@backstage/catalog-model": "workspace:^",

plugins/user-settings-backend/package.json

@@ -48,7 +48,6 @@
     "test": "backstage-cli package test"
   },
   "dependencies": {
-    "@backstage/backend-defaults": "workspace:^",
     "@backstage/backend-plugin-api": "workspace:^",
     "@backstage/errors": "workspace:^",
     "@backstage/plugin-auth-node": "workspace:^",