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

packages/frontend-plugin-api/package.json

@@ -49,7 +49,7 @@
     "@backstage/types": "workspace:^",
     "@backstage/version-bridge": "workspace:^",
     "@standard-schema/spec": "^1.1.0",
-    "zod": "^3.25.76 || ^4.0.0",
+    "zod": "^4.0.0",
     "zod-to-json-schema": "^3.25.1"
   },
   "devDependencies": {