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

docker-compose.yml

@@ -7,7 +7,7 @@ services:
       - "7000:7000"
     environment:
       RUST_LOG: "info"
-      QPQ_LISTEN: "0.0.0.0:7000"
+      QPC_LISTEN: "0.0.0.0:7000"
     # Healthcheck: attempt a TCP connection to port 7000.
     # Uses bash /dev/tcp — available in debian:bookworm-slim without extra packages.
     healthcheck: