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/workflows/index.md

@@ -4,7 +4,7 @@ CCW 的 4 级工作流系统编排从需求到部署代码的整个开发生命
 
 ## 工作流级别
 
-```
+```text
 Level 1: 规范
     ↓
 Level 2: 规划
@@ -105,7 +105,7 @@ Skill(skill="team-lifecycle-v4", args="构建用户身份验证系统")
 
 ## 工作流可视化
 
-```
+```text
 ┌─────────────────────────────────────────────────────────────┐
 │                    工作流编排                               │
 ├─────────────────────────────────────────────────────────────┤