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/delivery-service.md

@@ -6,8 +6,8 @@ recipient identity key and channel identifier. The DS exposes three operations
 through the `NodeService` RPC interface: `enqueue`, `fetch`, and `fetchWait`.
 
 **Sources:**
-- `crates/quicproquo-server/src/main.rs` (RPC handlers)
-- `crates/quicproquo-server/src/storage.rs` (queue storage)
+- `crates/quicprochat-server/src/main.rs` (RPC handlers)
+- `crates/quicprochat-server/src/storage.rs` (queue storage)
 - `schemas/node.capnp` (wire schema)
 
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