Add terminal client, memory, model fallback, version and install improvements

- codecraft: full-screen terminal client (ratatui) – local tools and files,
  models via the CodeCraft server gateway or own providers (standalone with a
  guided setup), slash commands, @files, permission dialogs, resume, update
- Static Linux CLI builds (x86_64/aarch64, cargo-zigbuild) served by the
  server: /cli/install.sh and /cli/download/<target>
- Project memory (remember tool, .codecraft/memory.md) and personal memory
- Model fallback when a host is unreachable or a budget is used up
- Version/commit in UI and health, daily release check, "What's new" dialog
- PWA: install button, maskable icon, manifest id and screenshots
- Case-insensitive detection of connection errors for retries

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docker-compose.yml

@@ -7,7 +7,11 @@
 # Rebuilding or recreating the container keeps all of it.
 services:
   codecraft:
-    build: .
+    build:
+      context: .
+      args:
+        # Shown in Settings and /api/health: GIT_COMMIT=$(git rev-parse --short HEAD) docker compose build
+        GIT_COMMIT: ${GIT_COMMIT:-}
     image: codecraft:latest
     container_name: codecraft
     restart: unless-stopped