feat: add zh/en/ja translations for s10-s19 + s08 SVG fix

- s10 System Prompt: full EN/JA README + SVG translations
- s11 Error Recovery: EN/JA README translations
- s12 Task System: full EN/JA README + 2 SVG translations
- s15 Agent Teams: full EN/JA README + 4 SVG translations
- s16 Team Protocols: full EN/JA README + 2 SVG translations
- s17 Autonomous Agents: full EN/JA README + 2 SVG translations
- s18 Worktree Isolation: full EN/JA README + 2 SVG translations
- s19 MCP Plugin: full EN/JA README + 2 SVG translations
- s08: fix compaction-layers.en.svg (was wrong diagram) + add .ja.svg

Author: Bill-Billion