T01: core infrastructure + auth + multi-tenant + RLS

- 10 models: tenants, users, user_tenants, roles, sessions, audit_log, deletion_log, notifications, password_reset_tokens, api_tokens
- Session-based auth (Redis + PostgreSQL audit trail)
- Multi-tenant with ORM-level filtering + PostgreSQL RLS (set_config)
- RBAC with roles/permissions + field-level permissions
- CSRF protection via Origin header validation
- Auth rate limiting (Redis counters with TTL)
- CORS with explicit origins (no wildcard)
- Health endpoint (no auth required)
- Notification service + audit log middleware
- 29 tests, 26 ACs, all passing
- Coverage: 62% (infrastructure modules pending coverage in later tasks)

app/schemas/role.py

@@ -0,0 +1,26 @@
+"""Role schemas."""
+
+from __future__ import annotations
+
+from typing import Any
+
+from pydantic import BaseModel, Field
+
+
+class RoleCreate(BaseModel):
+    name: str = Field(..., min_length=1, max_length=100)
+    permissions: dict[str, Any] = Field(default_factory=dict)
+    field_permissions: dict[str, Any] = Field(default_factory=dict)
+
+
+class RoleUpdate(BaseModel):
+    name: str | None = None
+    permissions: dict[str, Any] | None = None
+    field_permissions: dict[str, Any] | None = None
+
+
+class RoleResponse(BaseModel):
+    id: str
+    name: str
+    permissions: dict[str, Any]
+    field_permissions: dict[str, Any]