Initial commit: SenSu Alpha 0.2.0

- 13-service async plugin framework
- Textual TUI with CLI fallback
- Plugin hot-reload + permission system
- Web management panel (aiohttp)
- Bridge-based inter-module communication
- 10 regression tests

Fixes applied:
- PBKDF2-SHA256 auth (was plain SHA256)
- Auth bypass removed (was allow-all on fail)
- Bare excepts replaced with logged errors
- CatFramework/DreamSu -> SenSu naming unified
- ServiceManager: health checks + startup_order
- Env var credentials (SENSU_ADMIN_PASSWORD etc)

static/web_panel/pages/plugins.html

@@ -0,0 +1,5 @@
+<div style="display:flex; justify-content:space-between; align-items:center; margin-bottom:1rem;">
+    <h2 style="color:var(--accent);">📦 插件管理</h2>
+    <button class="btn-sm" onclick="window.PluginsModule.refresh()">🔄 刷新</button>
+</div>
+<div id="plugin-list" class="plugin-list">加载中...</div>