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>

server/resources-cli/install.sh

@@ -0,0 +1,46 @@
+#!/bin/sh
+# Install the CodeCraft terminal client (codecraft) from __CODECRAFT_URL__
+#   curl -fsSL __CODECRAFT_URL__/cli/install.sh | sh
+# Options (environment): CODECRAFT_INSTALL_DIR (default ~/.local/bin)
+set -eu
+
+SERVER="__CODECRAFT_URL__"
+DIR="${CODECRAFT_INSTALL_DIR:-$HOME/.local/bin}"
+
+os=$(uname -s | tr '[:upper:]' '[:lower:]')
+arch=$(uname -m)
+case "$arch" in
+  x86_64|amd64) arch=x86_64 ;;
+  aarch64|arm64) arch=aarch64 ;;
+  *) echo "codecraft: unsupported architecture $arch" >&2; exit 1 ;;
+esac
+case "$os" in
+  linux) ;;
+  *) echo "codecraft: no prebuilt binary for $os yet – build from source: cargo install --git <repo> codecraft-cli" >&2; exit 1 ;;
+esac
+
+target="$os-$arch"
+url="$SERVER/cli/download/$target"
+mkdir -p "$DIR"
+tmp="$DIR/.codecraft.download"
+echo "Downloading codecraft ($target) from $SERVER …"
+if command -v curl >/dev/null 2>&1; then
+  curl -fsSL "$url" -o "$tmp"
+elif command -v wget >/dev/null 2>&1; then
+  wget -q "$url" -O "$tmp"
+else
+  echo "codecraft: needs curl or wget" >&2; exit 1
+fi
+chmod +x "$tmp"
+mv "$tmp" "$DIR/codecraft"
+echo "Installed $DIR/codecraft ($("$DIR/codecraft" --version 2>/dev/null || echo codecraft))"
+
+case ":$PATH:" in
+  *":$DIR:"*) ;;
+  *) echo "Note: $DIR is not in your PATH – add this to your shell profile:"
+     echo "  export PATH=\"$DIR:\$PATH\"" ;;
+esac
+echo
+echo "Next steps:"
+echo "  codecraft login $SERVER      # sign in with your CodeCraft account"
+echo "  codecraft                    # start in your project folder"