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/docker-compose.chat-test.yml

@@ -14,7 +14,7 @@ services:
       context: ..
       dockerfile: docker/Dockerfile.chat-test
     command: >-
-      qpq-server
+      qpc-server
         --listen 0.0.0.0:7000
         --data-dir /data
         --tls-cert /data/server-cert.der
@@ -43,10 +43,10 @@ services:
     entrypoint: ["sleep", "infinity"]
     environment:
       RUST_LOG: warn
-      QPQ_ACCESS_TOKEN: devtoken
-      QPQ_CA_CERT: /data/server-cert.der
-      QPQ_SERVER_NAME: localhost
-      QPQ_SERVER: "server:7000"
+      QPC_ACCESS_TOKEN: devtoken
+      QPC_CA_CERT: /data/server-cert.der
+      QPC_SERVER_NAME: localhost
+      QPC_SERVER: "server:7000"
     volumes:
       - server-data:/data:ro
     working_dir: /chat
@@ -65,10 +65,10 @@ services:
     entrypoint: ["sleep", "infinity"]
     environment:
       RUST_LOG: warn
-      QPQ_ACCESS_TOKEN: devtoken
-      QPQ_CA_CERT: /data/server-cert.der
-      QPQ_SERVER_NAME: localhost
-      QPQ_SERVER: "server:7000"
+      QPC_ACCESS_TOKEN: devtoken
+      QPC_CA_CERT: /data/server-cert.der
+      QPC_SERVER_NAME: localhost
+      QPC_SERVER: "server:7000"
     volumes:
       - server-data:/data:ro
     working_dir: /chat