feat: API Key 系统 — CRUD + panel_auth 集成 + 持久化

新增:
- services/web_panel/routes/apikeys.py — 创建/列表/删除 API Key
- panel_auth() 双重验证: Session Store → API Key fallback
- _check_plugin_auth() 支持 API Key
- API Key 持久化到 SenSuDB (config_kv 表)
- 格式: sk- + 48 hex chars
- 脱敏显示 (前8后4)
- 删除后立即失效 (401)

WebPanelManager 注册 apikeys 路由

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

config/plugins/commands.yaml

@@ -89,6 +89,6 @@ commands:
     permissions:
     - framework.command.test
     source: internal
-last_updated: 12807.090239176
+last_updated: 13895.634814802
 plugin_commands: {}
 total_commands: 18