Refactor documentation for code commands and workflows

- Updated command syntax formatting to use code blocks for clarity in `prep.md`, `review.md`, and `spec.md`.
- Enhanced architectural diagrams in `ch01-what-is-claude-dms3.md` and core concepts in `ch03-core-concepts.md` using mermaid syntax for better visualization.
- Improved workflow diagrams in `ch04-workflow-basics.md` and `4-level.md` to provide clearer representations of processes.
- Added troubleshooting section in `installation.md` to address common installation issues and provide quick start examples.
- Revised skill documentation in `claude-meta.md` and `claude-workflow.md` to standardize command triggers and output structures.
- Updated best practices and workflow index documentation to enhance readability and understanding of workflow levels and practices.

docs/zh/commands/codex/prep.md

@@ -38,7 +38,7 @@
 **功能**: 委托给 universal-executor 代理，通过 Gemini/Qwen CLI 分析项目并返回 JSON 核心内容包用于任务上下文。
 
 **语法**:
-```
+```bash
 /memory:prepare [--tool gemini|qwen] "任务上下文描述"
 ```
 

docs/zh/commands/codex/review.md

@@ -19,7 +19,7 @@
 **功能**: 使用 Codex CLI 通过 ccw 端点进行交互式代码审查，支持可配置的审查目标、模型和自定义指令。
 
 **语法**:
-```
+```bash
 /cli:codex-review [--uncommitted|--base <分支>|--commit <sha>] [--model <模型>] [--title <标题>] [提示]
 ```