fix(ci): B5 整合測試改用 docker exec psql，不依賴主機 psql 指令

runner 環境無 psql binary (exitcode 127)
改為從 postgres-test container 內執行 psql，透過 stdin 傳入 SQL

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

.gitea/workflows/cd.yaml

@@ -129,9 +129,10 @@ jobs:
         run: |
           cd apps/api
           docker compose -f docker-compose.test.yml up -d --wait
-          PGPASSWORD=awoooi_test_2026 psql \
-            "postgresql://awoooi@127.0.0.1:15432/awoooi_test" \
-            -f tests/integration/setup_test_schema.sql -q
+          # psql 從 postgres container 執行，不需要主機安裝 psql
+          docker compose -f docker-compose.test.yml exec -T postgres-test \
+            psql -U awoooi -d awoooi_test \
+            -f /dev/stdin < tests/integration/setup_test_schema.sql
           TEST_DATABASE_URL="postgresql+asyncpg://awoooi:awoooi_test_2026@127.0.0.1:15432/awoooi_test" \
             python3.11 -m pytest tests/integration/test_b5_core_flows.py -v --tb=short
           TEST_EXIT=$?