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/prometheus-alerts.yml

@@ -1,16 +1,16 @@
 groups:
-  - name: qpq-server
+  - name: qpc-server
     rules:
-      - alert: QpqServerDown
-        expr: up{job="qpq-server"} == 0
+      - alert: QpcServerDown
+        expr: up{job="qpc-server"} == 0
         for: 1m
         labels:
           severity: critical
         annotations:
-          summary: "qpq-server is down"
-          description: "Prometheus cannot scrape qpq-server metrics for > 1 minute."
+          summary: "qpc-server is down"
+          description: "Prometheus cannot scrape qpc-server metrics for > 1 minute."
 
-      - alert: QpqHighAuthFailureRate
+      - alert: QpcHighAuthFailureRate
         expr: rate(auth_login_failure_total[5m]) > 10
         for: 2m
         labels:
@@ -19,7 +19,7 @@ groups:
           summary: "High authentication failure rate"
           description: "{{ $value | printf \"%.1f\" }} auth failures/sec over 5 minutes."
 
-      - alert: QpqRateLimitActive
+      - alert: QpcRateLimitActive
         expr: rate(rate_limit_hit_total[5m]) > 5
         for: 5m
         labels:
@@ -27,7 +27,7 @@ groups:
         annotations:
           summary: "Rate limiting is actively rejecting requests"
 
-      - alert: QpqDeliveryQueueHigh
+      - alert: QpcDeliveryQueueHigh
         expr: delivery_queue_depth > 10000
         for: 10m
         labels:
@@ -35,7 +35,7 @@ groups:
         annotations:
           summary: "Delivery queue depth is high ({{ $value }})"
 
-      - alert: QpqDeliveryQueueCritical
+      - alert: QpcDeliveryQueueCritical
         expr: delivery_queue_depth > 100000
         for: 5m
         labels:
@@ -43,7 +43,7 @@ groups:
         annotations:
           summary: "Delivery queue depth is critical ({{ $value }})"
 
-      - alert: QpqLowAuthSuccessRatio
+      - alert: QpcLowAuthSuccessRatio
         expr: >
           rate(auth_login_success_total[5m])
           / (rate(auth_login_success_total[5m]) + rate(auth_login_failure_total[5m]))