feat: platform.db 模型与超管引导（WAL/scrypt/幂等bootstrap）

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

app/main.py

@@ -5,7 +5,12 @@ import logging
 from fastapi import FastAPI
 from fastapi.staticfiles import StaticFiles
 
-from app.engine.config import STATIC_DIR
+from app.engine.config import STATIC_DIR, settings
+from app.platform.db import (
+    bootstrap_superuser,
+    ensure_platform_schema,
+    make_platform_engine,
+)
 from app.platform.host_middleware import TenantHostMiddleware
 from app.platform.registry import TenantRegistry
 
@@ -15,6 +20,7 @@ logger = logging.getLogger(__name__)
 BASE_DIR = Path(__file__).resolve().parents[1]
 SEED_DIR = BASE_DIR / "seed_profiles"
 TENANTS_DIR = BASE_DIR / "tenants"        # .gitignore 已忽略 tenants/*.db
+PLATFORM_DB = BASE_DIR / "platform.db"    # .gitignore 已忽略 platform.db*
 
 
 @asynccontextmanager
@@ -26,7 +32,22 @@ async def lifespan(app: FastAPI):
         registry = TenantRegistry.load_from_dir(SEED_DIR, data_dir=TENANTS_DIR)
         app.state.registry = registry
 
+    # 平台库测试缝(Phase 2 Task 1,同 registry 缝模式):预置过
+    # app.state.platform_engine(临时库)则沿用——不预置则每个 TestClient
+    # 测试都会在仓库根建出真实 platform.db。schema+bootstrap 无条件跑
+    # (两者幂等):预置引擎同样被建到可用,Task 2 起认证测试直接可用。
+    platform_engine = getattr(app.state, "platform_engine", None)
+    if platform_engine is None:
+        platform_engine = make_platform_engine(PLATFORM_DB)
+        app.state.platform_engine = platform_engine
+
     try:
+        await ensure_platform_schema(platform_engine)
+        await bootstrap_superuser(
+            platform_engine,
+            username=settings.ADMIN_USERNAME,
+            password=settings.ADMIN_PASSWORD)
+
         # 询盘推送(设计 8.2): 清扫崩溃遗留的 stale pending → failed。逐租户、
         # 用该租户自己的 session_factory;db 文件不存在的租户跳过——全新库
         # 无遗留行,保持 engine 懒建纪律(租户 engine 由 Host 中间件按请求
@@ -48,8 +69,10 @@ async def lifespan(app: FastAPI):
         yield
     finally:
         # 幂等于"更少的引擎":启动半途失败也把已建好的 engine 关掉
-        # (Windows 文件锁: 不关则库文件删不掉)
+        # (Windows 文件锁: 不关则库文件删不掉)。platform_engine 含预置的
+        # 测试引擎——dispose 后 engine 对象仍可重连,测试侧重置引用即可。
         await registry.dispose_all()
+        await platform_engine.dispose()
 
 
 app = FastAPI(title="HESUPIPE AI 客服", lifespan=lifespan)