feat(v0.5.2): 插件索引仓库 + install 命令

PluginIndex 服务:
- 从远程 JSON 索引获取可用插件列表
- 支持 zip 包和单文件 .py 两种格式安装
- 自动解压/移动到 plugins/ 目录
- 默认索引地址: GitHub Pages

install 内置命令:
- install --list → 列出远程可用插件
- install <name> → 下载并安装
- 自动缓存索引，避免重复请求

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

services/command_service.py

@@ -281,15 +281,48 @@ class CommandService:
                     permissions=["framework.tui.control"],
                     source="internal"
                 )
-            
- 
-            
+
+            # 插件安装命令
+            self.register_command(
+                name="install",
+                handler=self._cmd_install,
+                description="从在线索引安装插件: install <name> 或 install --list",
+                permissions=["framework.plugin.install"],
+                source="internal",
+            )
+
             logger.info(f"内置命令注册完成，共注册 {len(self.commands)} 个命令")
             
         except Exception as e:
             logger.error(f"注册内置命令时出错: {str(e)}", exc_info=True)
             raise
 
+    async def _cmd_install(self, *args) -> str:
+        """插件安装命令"""
+        try:
+            from services.plugin_index import PluginIndex
+            index = PluginIndex()
+            if not args or args[0] == "--list":
+                plugins = await index.fetch_index()
+                if not plugins:
+                    return "📭 插件索引为空或无法连接"
+                lines = [f"📦 可用插件 ({len(plugins)}):", "=" * 40]
+                for p in plugins:
+                    lines.append(
+                        f"  🔹 {p.get('name','?')} v{p.get('version','?')} — "
+                        f"{p.get('description','?')[:50]}"
+                    )
+                lines.append("\n💡 install <name> 安装插件")
+                return "\n".join(lines)
+
+            name = args[0]
+            ok = await index.install(name)
+            if ok:
+                return f"✅ 插件安装完成: {name}\n💡 重启框架或使用热重载加载新插件"
+            return f"❌ 安装失败: {name}"
+        except ImportError:
+            return "❌ 缺少 aiohttp，无法使用插件安装功能"
+
     async def _cmd_netdiag(self, *args) -> str:
         """网络诊断命令"""
         try:

services/plugin_index.py

@@ -0,0 +1,108 @@
+#!/usr/bin/env python3
+"""插件索引仓库 — 在线 JSON 索引 + 一键安装"""
+import logging, json, os, asyncio, tempfile, zipfile, shutil
+from pathlib import Path
+from typing import Optional, List, Dict
+
+logger = logging.getLogger(__name__)
+
+DEFAULT_INDEX_URL = "https://raw.githubusercontent.com/AskaEth/SenSu-plugins/main/index.json"
+
+
+class PluginIndex:
+    def __init__(self, index_url: str = DEFAULT_INDEX_URL):
+        self.index_url = index_url
+        self._cache: Optional[List[Dict]] = None
+
+    async def fetch_index(self, force: bool = False) -> List[Dict]:
+        """获取远程插件索引"""
+        if self._cache is not None and not force:
+            return self._cache
+        try:
+            import aiohttp
+            async with aiohttp.ClientSession() as session:
+                async with session.get(self.index_url, timeout=aiohttp.ClientTimeout(total=15)) as resp:
+                    if resp.status == 200:
+                        data = await resp.json()
+                        self._cache = data if isinstance(data, list) else data.get("plugins", [])
+                        logger.info(f"插件索引已加载: {len(self._cache)} 个可用插件")
+                        return self._cache
+                    else:
+                        logger.warning(f"插件索引请求失败: HTTP {resp.status}")
+                        return []
+        except Exception as e:
+            logger.warning(f"无法获取插件索引 ({self.index_url}): {e}")
+            return []
+
+    def search(self, name: str) -> Optional[Dict]:
+        """在缓存中搜索插件"""
+        if not self._cache:
+            return None
+        for p in self._cache:
+            if p.get("name") == name:
+                return p
+        return None
+
+    def list_plugins(self) -> List[str]:
+        if not self._cache:
+            return []
+        return [f"{p.get('name','?')} v{p.get('version','?')} — {p.get('description','?')[:60]}"
+                for p in self._cache]
+
+    async def install(self, name: str, target_dir: str = "plugins") -> bool:
+        """下载并安装指定插件到 plugins/ 目录"""
+        plugin = self.search(name)
+        if not plugin:
+            # Try to refresh cache
+            await self.fetch_index(force=True)
+            plugin = self.search(name)
+        if not plugin:
+            logger.error(f"插件未在索引中找到: {name}")
+            return False
+
+        download_url = plugin.get("download_url") or plugin.get("url")
+        if not download_url:
+            logger.error(f"插件 {name} 缺少下载地址")
+            return False
+
+        target = Path(target_dir) / name
+        if target.exists():
+            logger.warning(f"插件目录已存在: {target}")
+            return False
+
+        try:
+            import aiohttp
+            async with aiohttp.ClientSession() as session:
+                async with session.get(download_url, timeout=aiohttp.ClientTimeout(total=120)) as resp:
+                    if resp.status != 200:
+                        logger.error(f"下载失败: HTTP {resp.status}")
+                        return False
+                    content = await resp.read()
+
+            # Handle zip archives
+            if download_url.endswith(".zip"):
+                with tempfile.NamedTemporaryFile(suffix=".zip", delete=False) as tmp:
+                    tmp.write(content)
+                    tmp.flush()
+                    with zipfile.ZipFile(tmp.name, "r") as zf:
+                        # Zip 内第一层目录名可能不同, 提取到临时位置再移动
+                        extract_tmp = Path(tempfile.mkdtemp())
+                        zf.extractall(extract_tmp)
+                        # 如果 zip 内只有一个顶层目录, 直接用它
+                        members = list(extract_tmp.iterdir())
+                        if len(members) == 1 and members[0].is_dir():
+                            shutil.move(str(members[0]), str(target))
+                        else:
+                            extract_tmp.rename(target)
+                    os.unlink(tmp.name)
+            else:
+                # Assume single .py file plugin
+                target.mkdir(parents=True, exist_ok=True)
+                (target / "__init__.py").write_bytes(content)
+
+            logger.info(f"✅ 插件安装完成: {name} → {target}")
+            return True
+
+        except Exception as e:
+            logger.error(f"安装插件 {name} 失败: {e}")
+            return False