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/htmx.py

@@ -0,0 +1,15 @@
+from django.http import HttpResponse
+
+
+def htmx_response(content="", status=200, toast=None, redirect=None):
+    """
+    toast: {"type": "success|error|warning|info", "message": "..."}
+    """
+    response = HttpResponse(content, status=status)
+    if toast:
+        import json
+
+        response["HX-Trigger"] = json.dumps({"fonrey:toast": toast})
+    if redirect:
+        response["HX-Redirect"] = redirect
+    return response