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/cache.py

@@ -0,0 +1,13 @@
+from decouple import config as env
+
+
+class RedisCache:
+    """Redis 工具骨架。"""
+
+    @staticmethod
+    def get_client_url() -> str:
+        return env("REDIS_URL", default="redis://127.0.0.1:6379/0")
+
+    @staticmethod
+    def make_key(*parts: str) -> str:
+        return ":".join(["fonrey", *parts])