docs: note that workspace config files are hot-reloaded

[afjcjsbx]

📝 Description

Added a note in the Workspace Layout section of the configuration documentation explaining that changes to AGENTS.md, SOUL.md, USER.md, IDENTITY.md, and memory/MEMORY.md are automatically detected at runtime via file modification time (mtime) tracking. Users do not need to restart the gateway after modifying these files — the agent picks up the new content on the next request.

The note has been added to all available language versions of the configuration docs:

• docs/configuration.md (English)
• docs/zh/configuration.md (Chinese)
• docs/fr/configuration.md (French)
• docs/ja/configuration.md (Japanese)
• docs/pt-br/configuration.md (Portuguese BR)
• docs/vi/configuration.md (Vietnamese)

🗣️ Type of Change

• 🐞 Bug fix (non-breaking change which fixes an issue)
• ✨ New feature (non-breaking change which adds functionality)
• 📖 Documentation update
• ⚡ Code refactoring (no functional changes, no api changes)

🤖 AI Code Generation

• 🤖 Fully AI-generated (100% AI, 0% Human)
• 🛠️ Mostly AI-generated (AI draft, Human verified/modified)
• 👨‍💻 Mostly Human-written (Human lead, AI assisted or none)

🔗 Related Issue

#1740
#1728

📚 Technical Context (Skip for Docs)

• Reference URL: N/A
• Reasoning: N/A

🧪 Test Environment

• Hardware: N/A
• OS: N/A
• Model/Provider: N/A
• Channels: N/A

📸 Evidence (Optional)

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☑️ Checklist

• My code/docs follow the style of this project.
• I have performed a self-review of my own changes.
• I have updated the documentation accordingly.

[yinwm]

hi @afjcjsbx , the files are changed in #1705 , could you please make this PR join #1705

[afjcjsbx]

@yinwm sure! aligned with changes made in #1705