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These changes streamline the repository, reduce developer confusion, and prevent the accidental use of outdated deployment logic.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

@@ -0,0 +1,28 @@
+# Utiliser nginx pour servir les fichiers statiques
+FROM nginx:alpine
+
+# Copier les fichiers statiques
+COPY index.html /usr/share/nginx/html/
+COPY assets /usr/share/nginx/html/assets/
+COPY favicon.svg /usr/share/nginx/html/
+COPY logo.svg /usr/share/nginx/html/
+
+# Configuration nginx pour le routing SPA
+RUN echo 'server { \
+    listen 8080; \
+    server_name _; \
+    root /usr/share/nginx/html; \
+    index index.html; \
+    location / { \
+        try_files $uri $uri/ /index.html; \
+    } \
+    # Headers de sécurité \
+    add_header X-Frame-Options "SAMEORIGIN" always; \
+    add_header X-Content-Type-Options "nosniff" always; \
+    add_header X-XSS-Protection "1; mode=block" always; \
+}' > /etc/nginx/conf.d/default.conf
+
+# Nginx écoute sur le port 8080 (requis par Cloud Run)
+EXPOSE 8080
+
+CMD ["nginx", "-g", "daemon off;"]