[codex] Document source startup requirements

[hetaoBackend]

What changed

• Updated the English and Chinese README source-start instructions to install both backend/ and taskboard-electron/ dependencies.
• Documented that Bun must be available on PATH and that the desktop app owns the 127.0.0.1:9712 backend.
• Expanded installation troubleshooting for bun: command not found, missing backend dependencies, port conflicts, clean installs, and verification.
• Updated keep_running.sh so non-interactive bash sessions can find Bun installed under ~/.bun/bin.

Why

A fresh source checkout can fail to start if only the desktop package dependencies are installed, because the Electrobun host imports backend TypeScript directly. Some local shells also had Bun installed but not exposed through PATH, which made bun run start fail.

Validation

• git diff --check
• bash -n keep_running.sh

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Project	Deployment	Actions	Updated (UTC)
agentforge-landing	Ready	Preview, Comment	Jul 2, 2026 2:58am