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/design-rationale/adr-005-single-use-keypackages.md

@@ -100,8 +100,8 @@ This is a defense-in-depth measure. In practice, MLS's own signature verificatio
 |---|---|
 | `schemas/auth.capnp` | `AuthenticationService` interface: `uploadKeyPackage`, `fetchKeyPackage` |
 | `schemas/node.capnp` | `NodeService` interface: same methods with `Auth` parameter |
-| `crates/quicproquo-server/src/storage.rs` | Server-side KeyPackage storage (DashMap-backed queue) |
-| `crates/quicproquo-server/src/main.rs` | RPC handler: `fetchKeyPackage` implementation with atomic removal |
+| `crates/quicprochat-server/src/storage.rs` | Server-side KeyPackage storage (DashMap-backed queue) |
+| `crates/quicprochat-server/src/main.rs` | RPC handler: `fetchKeyPackage` implementation with atomic removal |
 
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