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/guide/ch06-best-practices.md

@@ -68,15 +68,16 @@
 
 ### 6.2.2 审查流程
 
-```
-┌─────────┐   ┌─────────┐   ┌─────────┐   ┌─────────┐
-│  提交   │──▶│  审查   │──▶│  反馈   │──▶│  修复   │
-│ 代码    │   │ 代码    │   │ 意见    │   │ 问题    │
-└─────────┘   └─────────┘   └─────────┘   └─────────┘
-     │            │            │            │
-     ▼            ▼            ▼            ▼
-  Push PR      自动审查      人工审查      修复验证
-  CI 检查      6 维度检查    代码走查      再次审查
+```mermaid
+graph LR
+    A[提交代码] --> B[审查代码]
+    B --> C[反馈意见]
+    C --> D[修复问题]
+
+    A --> A1[Push PR<br/>CI检查]
+    B --> B1[自动审查<br/>6维度检查]
+    C --> C1[人工审查<br/>代码走查]
+    D --> D1[修复验证<br/>再次审查]
 ```
 
 ### 6.2.3 审查清单