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

.github/CODEOWNERS

@@ -1,4 +1,4 @@
-# Code owners for quicproquo. PRs require review from owners.
+# Code owners for quicprochat. PRs require review from owners.
 # See https://docs.github.com/en/repositories/managing-your-repositorys-settings-and-features/customizing-your-repository/about-code-owners
 # Replace 'maintainers' with your GitHub user/team handle.
 
@@ -6,32 +6,32 @@
 * @maintainers
 
 # Security-critical: crypto primitives, MLS, hybrid KEM
-/crates/quicproquo-core/             @maintainers
+/crates/quicprochat-core/             @maintainers
 
 # Wire format: protobuf definitions, Cap'n Proto schemas
-/crates/quicproquo-proto/            @maintainers
+/crates/quicprochat-proto/            @maintainers
 /proto/                              @maintainers
 
 # Auth and server-side domain logic
-/crates/quicproquo-server/           @maintainers
+/crates/quicprochat-server/           @maintainers
 
 # Client SDK: auth, conversation store, messaging pipeline
-/crates/quicproquo-sdk/              @maintainers
+/crates/quicprochat-sdk/              @maintainers
 
 # CLI/TUI client
-/crates/quicproquo-client/           @maintainers
+/crates/quicprochat-client/           @maintainers
 
 # RPC framework: framing, middleware, QUIC transport
-/crates/quicproquo-rpc/              @maintainers
+/crates/quicprochat-rpc/              @maintainers
 
 # Key transparency
-/crates/quicproquo-kt/               @maintainers
+/crates/quicprochat-kt/               @maintainers
 
 # Plugin ABI (no_std C-ABI boundary)
-/crates/quicproquo-plugin-api/       @maintainers
+/crates/quicprochat-plugin-api/       @maintainers
 
 # P2P transport
-/crates/quicproquo-p2p/              @maintainers
+/crates/quicprochat-p2p/              @maintainers
 
 # CI and infrastructure
 /.github/                            @maintainers