Add --vars support to inventory creation, implement deep JSON overrides for host_vars, and update CI workflow to pass MASK_CREDENTIALS_IN_LOGS=false.

Includes:
- New apply_vars_overrides() with deep merge logic
- New --vars CLI argument in cli/create/inventory.py
- Added unit tests for vars handling in test_inventory.py
- Updated test-deploy workflow to pass --vars in all deploy phases

Ref: ChatGPT conversation https://chatgpt.com/share/69320f49-6c00-800f-8875-49d36935ae3a

.github/workflows/test-deploy.yml

@@ -48,6 +48,7 @@ jobs:
         run: |
           python -m cli.deploy.container run --image "$INFINITO_IMAGE" --build -- \
             --exclude "$EXCLUDED_ROLES" \
+            --vars '{"MASK_CREDENTIALS_IN_LOGS": false}' \
             --authorized-keys "ssh-ed25519 AAAA_TEST_DUMMY_KEY github-ci-dummy@infinito" \
             -- \
             -T server \
@@ -60,6 +61,7 @@ jobs:
         run: |
           python -m cli.deploy.container run --image "$INFINITO_IMAGE" -- \
             --exclude "$EXCLUDED_ROLES" \
+            --vars '{"MASK_CREDENTIALS_IN_LOGS": false}' \
             --authorized-keys "ssh-ed25519 AAAA_TEST_DUMMY_KEY github-ci-dummy@infinito" \
             -- \
             -T server \
@@ -73,6 +75,7 @@ jobs:
         run: |
           python -m cli.deploy.container run --image "$INFINITO_IMAGE" -- \
             --exclude "$EXCLUDED_ROLES" \
+            --vars '{"MASK_CREDENTIALS_IN_LOGS": false}' \
             --authorized-keys "ssh-ed25519 AAAA_TEST_DUMMY_KEY github-ci-dummy@infinito" \
             -- \
             -T server \