fix(db): enable test env cold-start migrations on empty database.

Use pgvector image with extensions-only init, seed legacy users before project/chat fixtures, and align test compose with goose-only schema bootstrap.

Co-authored-by: Cursor <cursoragent@cursor.com>

deploy/postgres/extensions_init.sql

@@ -0,0 +1,3 @@
+-- 各环境 Postgres 容器首次启动时仅安装扩展；业务表由 goose 迁移链创建。
+CREATE EXTENSION IF NOT EXISTS vector;
+CREATE EXTENSION IF NOT EXISTS "uuid-ossp";

deploy/postgres/goose/00011_2026-09-11-seed-ten-projects.sql

@@ -2,6 +2,13 @@
 -- 10 个示例医疗器械项目数据初始化脚本 (针对项目评审全流程落地)
 BEGIN;
 
+-- 空库冷启动：确保 creator_user_id=1 的外键目标存在（IAM 种子在后续迁移中补齐）
+INSERT INTO users (id, account_id, name, role) VALUES
+    (1, 'seed-admin', 'Seed Admin', 'engineer'),
+    (2, 'seed-zhanggong', '张工', 'engineer'),
+    (3, 'seed-lizhuguan', '李主管', 'engineer')
+ON CONFLICT (id) DO NOTHING;
+
 INSERT INTO projects (id, code, name, customer_name, device_type, intended_use, target_market, current_stage, environment, status, creator_user_id, active_workflow_key, workflow_selection_version, created_at, updated_at)
 VALUES (6001, 'PROJ-WANGJING-0021', '膝骨关节炎综合治疗仪', '中国中医科学院望京医院骨伤科', '中药离子导入与多频温控电热综合治疗设备', '用于早中期膝骨关节炎患者的局部经皮靶向定向透药导入、穴位多频电刺激止痛与温热理疗', '中国 NMPA II类 (YY 0601-2007 中药定向透药治疗仪, GB 9706.1-2020, YY 0505-2012)', 'V0.5', 'dev', 'active', 1, 'main', 1, now(), now())
 ON CONFLICT (id) DO UPDATE SET

docker-compose.test.yml

@@ -9,7 +9,7 @@ name: agent-test
 
 services:
   system-db:
-    image: postgres:16-alpine
+    image: pgvector/pgvector:pg16
     container_name: shuimu-system-pg-test
     command: ["postgres", "-c", "shared_buffers=256MB", "-c", "max_connections=150"]
     environment:
@@ -20,7 +20,7 @@ services:
       - "127.0.0.1:${SYSTEM_DB_PUBLISH_PORT:-5434}:5432"
     volumes:
       - test-system-pgdata:/var/lib/postgresql/data
-      - ./deploy/postgres/system_init.sql:/docker-entrypoint-initdb.d/01-init.sql:ro
+      - ./deploy/postgres/extensions_init.sql:/docker-entrypoint-initdb.d/01-extensions.sql:ro
     healthcheck:
       test: ["CMD-SHELL", "pg_isready -U ${SYSTEM_DB_USER:-app} -d ${SYSTEM_DB_NAME:-agent_system_test}"]
       interval: 5s