feat: release 2.1.0 with optional Flash final AI review

Default Flash final review to off and persist the setting across the UI,
MCP, SDK and queued tasks. Keep execution separate from test verdicts.

Bundle UI fonts and licenses to remove Google Fonts from startup builds.
Align backend/frontend versions and document installation and upgrades.

apps/showcase_ui/src/styles.scss

@@ -14,10 +14,42 @@
  * limitations under the License.
  */
 
-@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=Outfit:wght@300;400;500;600;700&family=Roboto:wght@400;500;700&display=swap');
-@import url('https://fonts.googleapis.com/css2?family=Material+Symbols+Outlined:opsz,wght,FILL,GRAD@20..48,100..700,0..1,-50..200');
 @import '@angular/cdk/overlay-prebuilt.css';
 
+// Keep fonts local so production builds and icons do not depend on Google Fonts.
+// Sources and licenses: public/fonts/README.md.
+@font-face {
+  font-family: 'Inter';
+  font-style: normal;
+  font-weight: 100 900;
+  font-display: swap;
+  src: url('/fonts/inter-latin-wght-normal.woff2') format('woff2');
+}
+
+@font-face {
+  font-family: 'Outfit';
+  font-style: normal;
+  font-weight: 100 900;
+  font-display: swap;
+  src: url('/fonts/outfit-latin-wght-normal.woff2') format('woff2');
+}
+
+@font-face {
+  font-family: 'Roboto';
+  font-style: normal;
+  font-weight: 100 900;
+  font-display: swap;
+  src: url('/fonts/roboto-latin-wght-normal.woff2') format('woff2');
+}
+
+@font-face {
+  font-family: 'Material Symbols Outlined';
+  font-style: normal;
+  font-weight: 100 700;
+  font-display: block;
+  src: url('/fonts/material-symbols-outlined.woff2') format('woff2');
+}
+
 .cdk-overlay-container {
   z-index: 1200 !important;
 }