- Move all default prompt content from PromptManager._ensure_* methods into aibox/prompts/ template files
- Add 8 new template files: 00_IDENTITY, 100_STATUS, 1_memory_search, 2_memory_save, 5_memo_management, 8_identity_management, 9_language_instruction, 11_emotion_management
- Refactor _ensure_* methods to copy from template directory via _ensure_from_template()
- _ensure_skill_files now auto-discovers N_*.md files instead of hardcoded list
- Update README.md with complete file manifest
- Single source of truth: aibox/prompts/ is the only prompt template source
- Rewrite ORCHESTRATOR_TURN_GUIDANCE: remove conservative '宁缺毋滥' principle,
add 5 trigger scenarios each for ask_user and express_emotion
- Rewrite conversation start guidance: split into 3 steps with concrete examples
- Improve AskUserTool description: from passive 'encountered a problem' to
proactive 'actively care about user, clarify needs, confirm intent'
- Improve ExpressEmotionTool description: add 'like caring for a friend' tone
and 4 usage scenarios
- Update 99_SOUL.md: add behavior rules 9 (proactive questioning) and 10
(emotional expression), expand workflow from 7 to 9 steps adding emotion
interaction and follow-up questioning
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