refactor(Makefile): remove App Engine configs and scripts, migrate launchpad to Cloud Run

This commit removes legacy App Engine deployment artifacts and updates the Makefile to reflect the successful migration of the `internal-launchpad` service to Cloud Run.

The following changes were made:

- Deleted obsolete permission scripts:
 - `fix-appengine-permissions-complete.sh`
 - `fix-project-level-permissions.sh`
 - `create-missing-repository.sh`
- Removed the `firebase/internal-launchpad/app.yaml` file.
- Updated `firebase.json` to remove the `launchpad` hosting configuration.

These changes streamline the repository, reduce developer confusion, and prevent the accidental use of outdated deployment logic.

firebase/internal-launchpad/app.yaml

@@ -0,0 +1,30 @@
+runtime: python312
+service: default
+instance_class: F1
+
+handlers:
+  - url: /
+    static_files: index.html
+    upload: index.html
+    secure: always
+
+  - url: /(.*\.(ico|png|jpg|jpeg|gif|svg|webp|woff|woff2|ttf|eot|json))
+    static_files: \1
+    upload: (.*\.(ico|png|jpg|jpeg|gif|svg|webp|woff|woff2|ttf|eot|json))
+    secure: always
+    expiration: "1d"
+
+  - url: /(.*\.(js|css|map))
+    static_files: \1
+    upload: (.*\.(js|css|map))
+    secure: always
+    expiration: "1d"
+
+  - url: /(.*)
+    static_files: \1
+    upload: (.*)
+    secure: always
+
+automatic_scaling:
+  max_instances: 5
+  min_instances: 0