feat(backend): T1.1 认证与权限 — 注册/登录/刷新/获取用户

- 后端：auth 路由（register/login/refresh/me）+ JWT + bcrypt 密码哈希
- 依赖注入：get_current_user + require_role 角色权限校验
- 跨数据库兼容：JSONBType（PG 用 JSONB，SQLite 用 JSON）
- 测试：11 个认证测试 + 4 个健康检查测试 = 15 passed

backend/app/schemas/auth.py

@@ -0,0 +1,46 @@
+"""认证相关 Pydantic schema。"""
+
+from pydantic import BaseModel, EmailStr, Field
+
+
+class LoginRequest(BaseModel):
+    """登录请求。"""
+
+    email: EmailStr
+    password: str = Field(..., min_length=6, max_length=128)
+
+
+class RegisterRequest(BaseModel):
+    """注册请求。"""
+
+    email: EmailStr
+    password: str = Field(..., min_length=6, max_length=128)
+    name: str = Field(..., min_length=1, max_length=100)
+    tenant_name: str = Field(..., min_length=1, max_length=200)
+    role: str = Field(default="founder", description="角色：gp/partner/post_invest_lead/investor/founder/admin")
+
+
+class TokenResponse(BaseModel):
+    """Token 响应。"""
+
+    access_token: str
+    refresh_token: str
+    token_type: str = "bearer"
+    expires_in: int = Field(description="access token 有效期（秒）")
+
+
+class RefreshRequest(BaseModel):
+    """刷新 token 请求。"""
+
+    refresh_token: str
+
+
+class UserInfo(BaseModel):
+    """用户信息。"""
+
+    id: str
+    email: str
+    name: str
+    role: str
+    tenant_id: str
+    is_active: bool