feat: complete s01-s19 docs quality overhaul — all chapters final

- s01-s09: full README rewrites + code.py updates + new SVG diagrams
- s01-s09: complete EN/JA translations with en/ja SVG files
- s10-s19: EN/JA README translations committed in prior commit
- All 19 chapters now have zh/en/ja trilingual coverage
- Add s01-s19-topic-map.md, remove outdated s01-s12-topic-map.md
- docs/zh updates for s01 and s03

Author: Bill-Billion

docs/zh/s01-the-agent-loop.md

@@ -25,7 +25,7 @@
 
 一个退出条件控制整个流程。循环持续运行, 直到模型不再调用工具。
 
-## 工作原理
+## 工作原理	
 
 1. 用户 prompt 作为第一条消息。
 

docs/zh/s03-todo-write.md

@@ -26,7 +26,7 @@
               | [ ] task A            |
               | [>] task B  <- doing  |
               | [x] task C            |
-              +-----------------------+
+              +-----------	------------+
                           |
               if rounds_since_todo >= 3:
                 inject <reminder> into tool_result