fix(deployments): fix docker-compose build context paths

Fix build context resolution in smoke test scripts:

- docker-compose.dev.yml: Use ${FETCHML_REPO_ROOT:-..} for api-server and worker
- docker-compose.prod.smoke.yml: Simplify dockerfile path (remove redundant FETCHML_REPO_ROOT)

Previously used 'context: ..' which resolved incorrectly when docker-compose
was run with --project-directory. Now consistently uses FETCHML_REPO_ROOT env var
for proper path resolution in both dev and prod smoke tests.

deployments/docker-compose.dev.yml

@@ -33,7 +33,7 @@ services:
       retries: 3
   api-server:
     build:
-      context: ..
+      context: ${FETCHML_REPO_ROOT:-..}
       dockerfile: build/docker/simple.Dockerfile
     container_name: ml-experiments-api
     user: "0:0"
@@ -126,7 +126,7 @@ services:
     restart: "no"
   worker:
     build:
-      context: ..
+      context: ${FETCHML_REPO_ROOT:-..}
       dockerfile: build/docker/simple.Dockerfile
     container_name: ml-experiments-worker
     user: "0:0"

deployments/docker-compose.prod.smoke.yml

@@ -33,7 +33,7 @@ services:
   api-server:
     build:
       context: ${FETCHML_REPO_ROOT:-..}
-      dockerfile: ${FETCHML_REPO_ROOT:-..}/build/docker/simple.Dockerfile
+      dockerfile: build/docker/simple.Dockerfile
     user: "0:0"
     restart: unless-stopped
     expose: