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

packaging/openwrt/files/quicprochat.uci

@@ -0,0 +1,7 @@
+config server 'server'
+    option listen '0.0.0.0:7000'
+    option data_dir '/var/lib/quicprochat'
+    option log_level 'info'
+    option tls_cert '/var/lib/quicprochat/server-cert.der'
+    option tls_key '/var/lib/quicprochat/server-key.der'
+    option production '1'