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/social/urls.py

@@ -0,0 +1,13 @@
+from django.urls import path
+
+from social import views
+
+app_name = "social"
+
+urlpatterns = [
+    path("", views.post_list, name="post_list"),
+    path("accounts/", views.account_list, name="account_list"),
+    path("compose/", views.composer, name="composer"),
+    path("api/generate/", views.api_generate, name="api_generate"),
+    path("<uuid:pk>/", views.post_detail, name="post_detail"),
+]