Bump zod dependency to v4 for packages using configSchema

These packages use `configSchema` with `zod/v4` imports and require the
full Zod v4 package for JSON Schema support. The dependency range is
narrowed from `^3.25.76 || ^4.0.0` to `^4.0.0`.

Also adds a `.patches` entry for the patch release.

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>
Made-with: Cursor

plugins/app/package.json

@@ -72,7 +72,7 @@
     "react-stately": "^3.46.0",
     "react-use": "^17.2.4",
     "zen-observable": "^0.10.0",
-    "zod": "^3.25.76 || ^4.0.0"
+    "zod": "^4.0.0"
   },
   "devDependencies": {
     "@backstage/cli": "workspace:^",