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/client.rb

@@ -2,12 +2,12 @@
 
 require "json"
 
-module QuicProQuo
-  # High-level quicproquo client for Ruby.
+module QuicProChat
+  # High-level quicprochat client for Ruby.
   #
-  # Wraps +libquicproquo_ffi+ via the +ffi+ gem.
+  # Wraps +libquicprochat_ffi+ via the +ffi+ gem.
   #
-  #   client = QuicProQuo::Client.new("127.0.0.1:5001", ca_cert: "ca.pem")
+  #   client = QuicProChat::Client.new("127.0.0.1:5001", ca_cert: "ca.pem")
   #   client.login("alice", "secret")
   #   client.send("bob", "hello")
   #   messages = client.receive(timeout_ms: 5000)
@@ -15,12 +15,12 @@ module QuicProQuo
   #
   # Or use the block form for automatic cleanup:
   #
-  #   QuicProQuo::Client.open("127.0.0.1:5001", ca_cert: "ca.pem") do |c|
+  #   QuicProChat::Client.open("127.0.0.1:5001", ca_cert: "ca.pem") do |c|
   #     c.login("alice", "secret")
   #     c.send("bob", "hello")
   #   end
   class Client
-    # Connect to a quicproquo server.
+    # Connect to a quicprochat server.
     #
     # @param server [String] Server address as +host:port+.
     # @param ca_cert [String] Path to PEM-encoded CA certificate.