fix(ci): use Docker service hostname for PostgreSQL in pytest job

act_runner executes jobs in Docker containers on the same network as
service containers. Use service name (postgres:5432) instead of
localhost with port mapping.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.gitea/workflows/ci.yml

@@ -48,8 +48,6 @@ jobs:
           POSTGRES_DB: wizamart_test
           POSTGRES_USER: test_user
           POSTGRES_PASSWORD: test_password
-        ports:
-          - 5433:5432
         options: >-
           --health-cmd "pg_isready -U test_user -d wizamart_test"
           --health-interval 10s
@@ -57,8 +55,10 @@ jobs:
           --health-retries 5
 
     env:
-      TEST_DATABASE_URL: "postgresql://test_user:test_password@localhost:5433/wizamart_test"
-      DATABASE_URL: "postgresql://test_user:test_password@localhost:5433/wizamart_test"
+      # act_runner executes jobs in Docker containers on the same network as services,
+      # so use the service name (postgres) as hostname with the internal port (5432)
+      TEST_DATABASE_URL: "postgresql://test_user:test_password@postgres:5432/wizamart_test"
+      DATABASE_URL: "postgresql://test_user:test_password@postgres:5432/wizamart_test"
 
     steps:
       - uses: actions/checkout@v4