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

sdks/python/examples/ffi_demo.py

@@ -1,8 +1,8 @@
 #!/usr/bin/env python3
 """Example: synchronous messaging using the Rust FFI backend.
 
-Requires libquicproquo_ffi to be built:
-    cargo build --release -p quicproquo-ffi
+Requires libquicprochat_ffi to be built:
+    cargo build --release -p quicprochat-ffi
 
 Set QPQ_LIB_PATH if the library is not in the default search path.
 
@@ -15,7 +15,7 @@ from __future__ import annotations
 
 import argparse
 
-from quicproquo import QpqClient, ConnectOptions
+from quicprochat import QpqClient, ConnectOptions
 
 
 def main() -> None: