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/src/internals/server-hooks.md

@@ -1,6 +1,6 @@
 # Server Hooks
 
-The `ServerHooks` trait provides a plugin system for extending the quicproquo
+The `ServerHooks` trait provides a plugin system for extending the quicprochat
 server. Hooks fire at key points in the request lifecycle — message delivery,
 authentication, channel creation, and message fetch — allowing you to inspect,
 log, rate-limit, or reject operations without modifying server internals.
@@ -169,7 +169,7 @@ impl ServerHooks for TracingHooks {
 ### Example: payload size limiter
 
 ```rust,ignore
-use quicproquo_server::hooks::{ServerHooks, HookAction, MessageEvent};
+use quicprochat_server::hooks::{ServerHooks, HookAction, MessageEvent};
 
 struct PayloadLimiter {
     max_bytes: usize,
@@ -191,7 +191,7 @@ impl ServerHooks for PayloadLimiter {
 ### Example: login auditor
 
 ```rust,ignore
-use quicproquo_server::hooks::{ServerHooks, AuthEvent};
+use quicprochat_server::hooks::{ServerHooks, AuthEvent};
 
 struct LoginAuditor;
 
@@ -210,7 +210,7 @@ impl ServerHooks for LoginAuditor {
 ### Example: composing multiple hooks
 
 ```rust,ignore
-use quicproquo_server::hooks::*;
+use quicprochat_server::hooks::*;
 
 struct CompositeHooks {
     hooks: Vec<Box<dyn ServerHooks>>,