chore: rename quicproquo → quicprochat in docs, Docker, CI, and packaging

Rename all project references from quicproquo/qpq to quicprochat/qpc
across documentation, Docker configuration, CI workflows, packaging
scripts, operational configs, and build tooling.

- Docker: crate paths, binary names, user/group, data dirs, env vars
- CI: workflow crate references, binary names, artifact names
- Docs: all markdown files under docs/, SDK READMEs, book.toml
- Packaging: OpenWrt Makefile, init script, UCI config (file renames)
- Scripts: justfile, dev-shell, screenshot, cross-compile, ai_team
- Operations: Prometheus config, alert rules, Grafana dashboard
- Config: .env.example (QPQ_* → QPC_*), CODEOWNERS paths
- Top-level: README, CONTRIBUTING, ROADMAP, CLAUDE.md

sdks/ruby/lib/quicprochat.rb

@@ -0,0 +1,23 @@
+# frozen_string_literal: true
+
+require_relative "quicprochat/ffi_bindings"
+require_relative "quicprochat/client"
+require_relative "quicprochat/errors"
+require_relative "quicprochat/version"
+
+# Ruby SDK for the quicprochat E2E encrypted messenger.
+#
+# Two usage patterns:
+#
+#   # Block form (auto-disconnect)
+#   QuicProChat::Client.open("127.0.0.1:5001", ca_cert: "ca.pem") do |client|
+#     client.login("alice", "secret")
+#     client.send("bob", "hello")
+#   end
+#
+#   # Manual lifecycle
+#   client = QuicProChat::Client.new("127.0.0.1:5001", ca_cert: "ca.pem")
+#   client.login("alice", "secret")
+#   client.disconnect
+module QuicProChat
+end