init: ShowenV2 项目骨架 — 数字生命窗口平台

- core/ 跨平台内核骨架 (Plugin trait, Message, ServiceManager, Config)
- plugins/ 空桩 (video, http, ble, screen, wifi)
- PROGRESS.md 进度跟踪, TEAM.md 团队档案
- cargo check 零 warning 通过

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

src/plugins/wifi/mod.rs

@@ -0,0 +1,39 @@
+//! WifiPlugin — WiFi 管理
+//!
+//! 通过 nmcli 实现 WiFi 扫描、连接、AP 热点。
+
+use crate::core::message::Message;
+use crate::core::plugin::{Plugin, PluginContext, PluginInfo, Platform};
+use anyhow::Result;
+
+pub struct WifiPlugin {
+    ctx: Option<PluginContext>,
+}
+
+impl WifiPlugin {
+    pub fn new() -> Self {
+        Self { ctx: None }
+    }
+}
+
+impl Plugin for WifiPlugin {
+    fn id(&self) -> &'static str { "wifi" }
+
+    fn info(&self) -> PluginInfo {
+        PluginInfo {
+            name: "WiFi Manager",
+            version: "0.2.0",
+            description: "WiFi 管理 (nmcli)",
+            platform: Platform::Linux,
+        }
+    }
+
+    fn init(&mut self, ctx: PluginContext) -> Result<()> {
+        self.ctx = Some(ctx);
+        Ok(())
+    }
+
+    fn start(&mut self) -> Result<()> { Ok(()) }
+    fn handle_message(&mut self, _msg: Message) -> Result<()> { Ok(()) }
+    fn stop(&mut self) -> Result<()> { Ok(()) }
+}