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

docs/operations/dashboards/qpc-overview.json

@@ -42,10 +42,10 @@
     }
   ],
   "id": null,
-  "uid": "qpq-overview",
-  "title": "quicproquo Server Overview",
-  "description": "Operational dashboard for quicproquo server instances",
-  "tags": ["quicproquo", "qpq"],
+  "uid": "qpc-overview",
+  "title": "quicprochat Server Overview",
+  "description": "Operational dashboard for quicprochat server instances",
+  "tags": ["quicprochat", "qpc"],
   "timezone": "browser",
   "editable": true,
   "graphTooltip": 1,
@@ -61,7 +61,7 @@
       "gridPos": { "h": 4, "w": 4, "x": 0, "y": 0 },
       "targets": [
         {
-          "expr": "up{job=\"qpq-server\"}",
+          "expr": "up{job=\"qpc-server\"}",
           "legendFormat": "{{instance}}"
         }
       ],