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/web/src/app.ts

@@ -1,5 +1,5 @@
 /**
- * quicproquo web client — main application.
+ * quicprochat web client — main application.
  *
  * Connects the TS SDK, WASM crypto, IndexedDB store, and the DOM together.
  */

sdks/web/src/store.ts

@@ -4,7 +4,7 @@
  * Stores conversations, messages, and identity state in the browser.
  */
 
-const DB_NAME = "quicproquo";
+const DB_NAME = "quicprochat";
 const DB_VERSION = 1;
 
 export interface StoredConversation {