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.

artemis/config/settings.py

@@ -131,6 +131,7 @@ class Settings(BaseSettings):
     # Worker-only override, applied after the user's JSON recording defaults.
     ARTEMIS_TASK_RECORDING_CONFIG: dict = Field(default_factory=dict)
     ARTEMIS_OUTPUTTER_ENABLED: bool = True
+    ARTEMIS_FLASH_FINAL_CHECK_ENABLED: bool = False
     ARTEMIS_STEP_SUMMARIZER_ENABLED: bool = True
     ARTEMIS_SCREENSHOT_LIMIT_ENABLED: bool = True
     # Consecutive Pro responses without a valid tool call before failing the task.