chore: disable auto-deploy workflows (manual dispatch only) (#167)

Remove push-to-main triggers from deploy.yaml (backend/CDK) and
deploy-mobile.yaml (iOS/TestFlight), leaving workflow_dispatch only.
CDK is not yet deployed; pausing auto-deploy until ready. Revert this
PR to re-enable.

.github/workflows/deploy-mobile.yaml

@@ -1,9 +1,7 @@
 name: Deploy Mobile (iOS)
 
+# Auto-deploy on push to main disabled for now; manual trigger only.
 on:
-  push:
-    branches: [main]
-    paths: ["mobile/**"]
   workflow_dispatch:
 
 concurrency:

.github/workflows/deploy.yaml

@@ -1,10 +1,8 @@
 name: Deploy
 
+# Auto-deploy on push to main disabled for now; manual trigger only.
 on:
-  push:
-    branches: [main]
-    paths-ignore:
-      - "mobile/**"
+  workflow_dispatch:
 
 concurrency:
   group: deploy-backend