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/examples/demo.rb

@@ -1,14 +1,14 @@
 #!/usr/bin/env ruby
 # frozen_string_literal: true
 
-# Example: quicproquo Ruby SDK demo.
+# Example: quicprochat Ruby SDK demo.
 #
 # Usage:
 #   ruby demo.rb --server 127.0.0.1:5001 --ca-cert ca.pem \
 #     --user alice --pass secret --recipient bob --message "hello"
 
 require "optparse"
-require_relative "../lib/quicproquo"
+require_relative "../lib/quicprochat"
 
 options = {
   server: "127.0.0.1:5001",
@@ -26,7 +26,7 @@ OptionParser.new do |opts|
   opts.on("--message TEXT", "Message") { |v| options[:message] = v }
 end.parse!
 
-QuicProQuo::Client.open(options[:server], ca_cert: options[:ca_cert]) do |client|
+QuicProChat::Client.open(options[:server], ca_cert: options[:ca_cert]) do |client|
   puts "Connected to #{options[:server]}"
 
   client.login(options[:user], options[:pass])