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.

mcp_server/tools/automation.py

@@ -34,6 +34,7 @@ CAPABILITY_FIELDS = {
     "recording_enabled",
     "recording",
     "outputter_enabled",
+    "flash_final_check_enabled",
     "step_summarizer_enabled",
     "screenshot_limit_enabled",
     "task_timeout_seconds",
@@ -192,6 +193,7 @@ async def mobile_config(
     tool_fallback_no_progress_attempts. 'default' omits reasoning;
     unsupported values fail visibly.
     capabilities: video_enabled and recording_enabled are independent; outputter_enabled,
+    flash_final_check_enabled (false; Flash exit-only AI review),
     step_summarizer_enabled, screenshot_limit_enabled, task_timeout_seconds (default 1800),
     observation_timeout_seconds (60), observation_max_attempts (3),
     device_command_timeout_seconds (10), action_failure_attempts (3),