ci: change all workflows to manual trigger only (workflow_dispatch)

Updated workflows to use workflow_dispatch instead of pull_request/push:

- backend-foundation.yml: Removed pull_request and push triggers

- mobile-ci.yml: Removed pull_request and push triggers with path filters

- web-quality.yml: Removed pull_request and push triggers

Workflows now only run manually via Actions tab. This gives more control over when CI runs and reduces unnecessary workflow executions.

.github/workflows/web-quality.yml

@@ -1,14 +1,7 @@
 name: Web Quality
 
 on:
-  pull_request:
-    branches:
-      - dev
-      - main
-  push:
-    branches:
-      - dev
-      - main
+  workflow_dispatch:
 
 jobs:
   web-quality: