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.

.env.example

@@ -29,6 +29,8 @@ ARTEMIS_RECORDING_ENABLED=false
 # JSON 配置 agent.recording 和任务 recording 可覆盖。截图分辨率不受此配置影响。
 ARTEMIS_RECORDING_CONFIG={"codec":"auto","max_long_edge":1280,"fps":15,"h265_kbps":1000,"h264_kbps":1500,"computer_scope":"screen","minimum_disk_mb":256,"hevc_playback":false}
 ARTEMIS_OUTPUTTER_ENABLED=true
+# Flash 执行结束后的独立 AI 分析与判定，默认关闭；不影响 Pro 或执行过程。
+ARTEMIS_FLASH_FINAL_CHECK_ENABLED=false
 ARTEMIS_STEP_SUMMARIZER_ENABLED=true
 # 默认将任务截图长边压至 2048；false 保留设备原始截图。长边值可在 config/artemis.jsonc 的 agent.screenshot 中覆盖。
 ARTEMIS_SCREENSHOT_LIMIT_ENABLED=true