feat: 新增 account 和 plan 目录

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

account/admin/skills/system/install-hub-agent/SKILL.md

@@ -0,0 +1,57 @@
+---
+name: install-hub-agent
+description: Download and install an Agent from the OpenAkita Platform Agent Store
+system: true
+handler: agent_hub
+tool-name: install_hub_agent
+category: Platform
+---
+
+# install-hub-agent
+
+Download and install an Agent from the OpenAkita Platform Agent Store to the local system.
+
+## When to Use
+
+- User wants to install a specific Agent from the hub
+- User says "安装这个 Agent" after browsing search results
+- User provides an Agent ID to install
+
+## Workflow
+
+1. (Optional) Call `search_hub_agents` first to find the Agent
+2. (Optional) Call `get_hub_agent_detail` to preview Agent details
+3. Call `install_hub_agent` with the `agent_id`
+4. The system will:
+   - Download the `.akita-agent` package from the platform
+   - Extract and install bundled skills (version-aware, skips if same/newer exists locally)
+   - Fetch required external skills from their original GitHub repos
+   - Register the Agent profile locally
+   - Auto-reload skills so the Agent is immediately usable
+
+## Tools
+
+### install_hub_agent
+| Parameter | Required | Description |
+|-----------|----------|-------------|
+| `agent_id` | Yes | The platform Agent ID (from search results) |
+| `force` | No | Force overwrite if local ID conflict (default: false) |
+
+### get_hub_agent_detail
+| Parameter | Required | Description |
+|-----------|----------|-------------|
+| `agent_id` | Yes | The platform Agent ID to inspect |
+
+## Important Notes
+
+- Installed Agents appear in the local Agent list immediately
+- Bundled skills go to `skills/custom/`, external skills go to `skills/community/`
+- Skills are version-deduplicated: if a newer version already exists locally, it is kept
+- Each installed skill gets a `.openakita-origin.json` tracking its source and version
+- The Agent's `hub_source` field records where it came from
+
+## Fallback
+
+If the platform is unavailable, the user can still:
+- Import Agents from `.akita-agent` files using `import_agent`
+- Export local Agents using `export_agent`