feat: add Daily Report to admin sidebar via custom AdminSite

- Create OpenClawAdminSite (openclaw_admin) with Daily Reports menu in sidebar
- Re-register Session/Message/ToolCall with custom site
- Add daily/daily-reports URLs at AdminSite level
- Override admin/index.html template for sidebar item
- Use self.admin_view (not admin.site.admin_view) for site-aware view wrapping
- Clean up admin.py: remove inline URLs from SessionAdmin (now at site level)

src/openclaw/admin_custom_site.py

@@ -0,0 +1,52 @@
+"""
+Custom AdminSite for OpenClaw — adds Daily Report to sidebar + URLs.
+Re-registers Session/Message/ToolCall from admin.py, and adds custom report URLs.
+"""
+
+from django.contrib.admin import AdminSite
+
+from openclaw.admin_new_views import daily_report_list_view, daily_report_detail_view
+
+
+class OpenClawAdminSite(AdminSite):
+    site_header = "OpenClaw Archive"
+    site_title = "OpenClaw Admin"
+    index_title = "Agent Sessions"
+
+    def get_urls(self):
+        from django.urls import path
+        urls = super().get_urls()
+        custom_urls = [
+            path(
+                "daily/",
+                self.admin_view(daily_report_list_view),
+                name="openclaw_daily",
+            ),
+            path(
+                "daily-reports/",
+                self.admin_view(daily_report_list_view),
+                name="openclaw_daily_reports",
+            ),
+            path(
+                "daily-reports/<str:agent_name>/<int:year>-<int:month>-<int:day>/",
+                self.admin_view(daily_report_detail_view),
+                name="openclaw_daily_report_detail",
+            ),
+        ]
+        return custom_urls + urls
+
+    def index(self, request, extra_context=None):
+        extra_context = extra_context or {}
+        extra_context["show_daily_report"] = True
+        return super().index(request, extra_context)
+
+
+openclaw_admin_site = OpenClawAdminSite(name="openclaw_admin")
+
+# Re-register models with this custom site (imported from admin.py)
+from openclaw.admin import SessionAdmin, MessageAdmin, ToolCallAdmin
+from openclaw.models import Session, Message, ToolCall
+
+openclaw_admin_site.register(Session, SessionAdmin)
+openclaw_admin_site.register(Message, MessageAdmin)
+openclaw_admin_site.register(ToolCall, ToolCallAdmin)