Add Django site, Docker packaging, and beta/prod Gitea deploys.

Unignore site/ (was blocked by mkdocs /site rule), add compose/Docker/uv tooling, and split deploys so push to main goes to beta while prod stays manual.

site/leads/admin.py

@@ -0,0 +1,16 @@
+from django.contrib import admin
+
+from leads.models import Lead, LeadNote
+
+
+class LeadNoteInline(admin.TabularInline):
+    model = LeadNote
+    extra = 0
+
+
+@admin.register(Lead)
+class LeadAdmin(admin.ModelAdmin):
+    list_display = ("contact", "status", "created_at")
+    list_filter = ("status",)
+    search_fields = ("contact__email", "contact__first_name", "contact__last_name")
+    inlines = [LeadNoteInline]