[codex] add Chinese beginner tutorial

[kaixuan147123]

What changed

• add a Chinese beginner roadmap that explains Loop, Prompt, Context, and Harness Engineering in plain language
• add per-session beginner cards with a single learning goal, an everyday analogy, a minimum learning target, and a guided click path
• add expandable line-by-line Chinese explanations below tutorial code blocks
• add beginner guidance to the full source viewer
• add Windows one-click start, installation-test, and safe stop helpers
• keep the new learning layer scoped to the zh locale; existing English and Japanese content remains unchanged

Why

The current course is comprehensive, but readers with no Python or agent-engineering background can struggle to connect the code examples to the underlying ideas or to run the project locally. This contribution adds a gradual bridge from concepts to simulation, source reading, and real execution.

User impact

Chinese beginners can follow a repeatable learning sequence:

1. understand the chapter in plain language
2. use the no-key simulator
3. expand line-by-line code explanations
4. inspect only the relevant source keywords
5. run the chapter after configuring an API key

The English and Japanese experiences are not modified by the locale-specific beginner components.

Safety

• API keys, .env, virtual environments, dependencies, and runtime PID files are excluded from Git
• the stop helper only terminates a PID recorded by the start helper and verifies that its command line is the tutorial's npm run dev process
• no credentials or local secrets are included in the commit

Validation

• npm.cmd run build
• tutorial-tools/test-installation.ps1
• PowerShell parser checks for all helper scripts
• manual browser verification of the Chinese roadmap, session guide, simulator step flow, and expandable code explanations

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