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/ruby/lib/quicprochat/ffi_bindings.rb

@@ -2,8 +2,8 @@
 
 require "ffi"
 
-module QuicProQuo
-  # Low-level FFI bindings to libquicproquo_ffi.
+module QuicProChat
+  # Low-level FFI bindings to libquicprochat_ffi.
   #
   # The library is located via:
   # 1. QPQ_LIB_PATH environment variable
@@ -12,7 +12,7 @@ module QuicProQuo
   module FFIBindings
     extend FFI::Library
 
-    # Status codes (mirrors crates/quicproquo-ffi/src/lib.rs).
+    # Status codes (mirrors crates/quicprochat-ffi/src/lib.rs).
     QPQ_OK            = 0
     QPQ_ERROR         = 1
     QPQ_AUTH_FAILED   = 2
@@ -22,14 +22,14 @@ module QuicProQuo
     # Locate and load the shared library.
     LIB_SEARCH_PATHS = [
       ENV.fetch("QPQ_LIB_PATH", nil),
-      File.expand_path("../../../../target/release/libquicproquo_ffi.so", __dir__),
-      File.expand_path("../../../../target/debug/libquicproquo_ffi.so", __dir__),
-      File.expand_path("../../../../target/release/libquicproquo_ffi.dylib", __dir__),
-      File.expand_path("../../../../target/debug/libquicproquo_ffi.dylib", __dir__),
-      "quicproquo_ffi",
+      File.expand_path("../../../../target/release/libquicprochat_ffi.so", __dir__),
+      File.expand_path("../../../../target/debug/libquicprochat_ffi.so", __dir__),
+      File.expand_path("../../../../target/release/libquicprochat_ffi.dylib", __dir__),
+      File.expand_path("../../../../target/debug/libquicprochat_ffi.dylib", __dir__),
+      "quicprochat_ffi",
     ].compact.freeze
 
-    lib_path = LIB_SEARCH_PATHS.find { |p| File.exist?(p) } || "quicproquo_ffi"
+    lib_path = LIB_SEARCH_PATHS.find { |p| File.exist?(p) } || "quicprochat_ffi"
     ffi_lib lib_path
 
     # QpqHandle* qpq_connect(const char*, const char*, const char*)