feat: usos sign-in, private calendar feed and timetable archive

.copier/backend.yml

@@ -0,0 +1,7 @@
+_commit: v0.3.0
+_src_path: https://git.kotikot.com/templates/blank.git
+layout: root
+part: backend
+project_name: usoscal
+project_slug: usoscal
+service: api

.copier/infra.yml

@@ -0,0 +1,7 @@
+_commit: v0.6.0
+_src_path: https://git.kotikot.com/templates/infra.git
+init_git: true
+layout: single
+mcp_servers: []
+project_description: USOS timetable as a calendar feed that keeps the past
+project_name: usoscal