Initial implementation of mcq — document reading queue

Single-binary service: push raw markdown via REST/gRPC API, read rendered
HTML through mobile-friendly web UI. MCIAS auth on all endpoints, SQLite
storage, goldmark rendering with GFM and syntax highlighting.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

deploy/examples/mcq.toml.example

@@ -0,0 +1,16 @@
+[server]
+listen_addr = ":8443"
+grpc_addr   = ":9443"
+tls_cert    = "srv/cert.pem"
+tls_key     = "srv/key.pem"
+
+[database]
+path = "srv/mcq.db"
+
+[mcias]
+server_url   = "https://mcias.svc.metacircular.net:8443"
+service_name = "mcq"
+tags         = []
+
+[log]
+level = "info"