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>

web/vite.config.ts

@@ -18,16 +18,24 @@ export default defineConfig({
         background_color: "#282828",
         display: "standalone",
         start_url: "/",
+        id: "/",
+        scope: "/",
+        orientation: "any",
+        categories: ["developer", "productivity"],
         icons: [
           { src: "icon-192.png", sizes: "192x192", type: "image/png" },
           { src: "icon-512.png", sizes: "512x512", type: "image/png" },
-          { src: "icon-512.png", sizes: "512x512", type: "image/png", purpose: "maskable" },
+          { src: "icon-maskable-512.png", sizes: "512x512", type: "image/png", purpose: "maskable" },
           { src: "icon.svg", sizes: "any", type: "image/svg+xml" },
         ],
+        screenshots: [
+          { src: "screenshots/wide.png", sizes: "1400x860", type: "image/png", form_factor: "wide", label: "Chat with an agent" },
+          { src: "screenshots/narrow.png", sizes: "780x1688", type: "image/png", form_factor: "narrow", label: "CodeCraft on the phone" },
+        ],
       },
       workbox: {
         // The API is always live data; only the app shell is cached.
-        navigateFallbackDenylist: [/^\/api/],
+        navigateFallbackDenylist: [/^\/api/, /^\/cli/],
         runtimeCaching: [],
         // The STEP importer (OpenCascade, ~8 MB) is loaded only when needed.
         globIgnores: ["**/occt-import-js*"],