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/sdk/wire-format.md

@@ -1,11 +1,11 @@
 # v2 Wire Format
 
-The quicproquo v2 protocol uses QUIC (RFC 9000) with TLS 1.3 as the transport layer and Protocol Buffers for message serialization.
+The quicprochat v2 protocol uses QUIC (RFC 9000) with TLS 1.3 as the transport layer and Protocol Buffers for message serialization.
 
 ## Connection
 
 - **Protocol**: QUIC with TLS 1.3
-- **ALPN**: `qpq`
+- **ALPN**: `qpc`
 - **Port**: 5001 (default)
 - **Certificate**: Server presents a TLS certificate; clients verify against a CA cert
 
@@ -137,7 +137,7 @@ This allows concurrent RPCs without head-of-line blocking.
 
 ## Protobuf Definitions
 
-All message types are defined in `proto/qpq/v1/*.proto`:
+All message types are defined in `proto/qpc/v1/*.proto`:
 
 | File | Services |
 |---|---|