Initialize Fonrey Django multi-tenant project skeleton

Set up the required directory layout, app scaffolding, core settings, templates, static assets, and Docker/Tailwind tooling to establish a standardized development baseline.

core/middleware/audit.py

@@ -0,0 +1,9 @@
+class AuditMiddleware:
+    """审计日志中间件骨架。"""
+
+    def __init__(self, get_response):
+        self.get_response = get_response
+
+    def __call__(self, request):
+        response = self.get_response(request)
+        return response