fix(ci): 用 /proc/net/route 取 host bridge IP，不依賴 ip 指令

ip 指令在精簡 runner 環境不存在，改用 /proc/net/route awk 解析
fallback 到 172.17.0.1 (docker0 慣例)

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

.gitea/workflows/cd.yaml

@@ -135,8 +135,12 @@ jobs:
             psql -U awoooi -d awoooi_test \
             < tests/integration/setup_test_schema.sql
           # DinD: runner 連 sibling container 需走 host bridge → port 15432
-          # docker0 bridge IP 通常是 172.17.0.1，但用 route 確保準確
-          HOST_IP=$(ip route | awk '/default/{print $3}' | head -1)
+          # ip 指令在精簡 runner 環境可能不存在，改用 /proc/net/route
+          HOST_IP=$(awk '$2=="00000000"{printf "%d.%d.%d.%d\n",
+            "0x"substr($3,7,2)+0,"0x"substr($3,5,2)+0,
+            "0x"substr($3,3,2)+0,"0x"substr($3,1,2)+0}' /proc/net/route | head -1)
+          # fallback: docker0 bridge 慣例 IP
+          [ -z "$HOST_IP" ] && HOST_IP="172.17.0.1"
           echo "host bridge IP: $HOST_IP"
           TEST_DATABASE_URL="postgresql+asyncpg://awoooi:awoooi_test_2026@${HOST_IP}:15432/awoooi_test?ssl=disable" \
             /opt/api-venv/bin/pytest tests/integration/test_b5_core_flows.py -v --tb=short