Rebuild bundled backend before packaging

[hetaoBackend]

Summary

• rebuild the bundled Python backend before Electron package/make so the macOS app ships the latest Feishu notification logic
• add a shared build script for the bundled backend and wire it into Electron prepackage/premake hooks
• keep Makefile packaging flows efficient by skipping duplicate backend rebuilds after the explicit build step

Test Plan

• uv run pytest tests/test_feishu_message_rendering.py tests/test_feishu_forwarded_messages.py -q
• node taskboard-electron/scripts/build-backend.mjs

[vercel]

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Project	Deployment	Actions	Updated (UTC)
agentforge-landing	Ready	Preview, Comment	Mar 20, 2026 1:15am