dudu MVP：五端语音输入法初始提交

- server：Go 网关（WS 流式识别中继/计费配额/微信登录支付 mock/反馈/埋点），gummy provider 已真实联调
- desktop：Tauri 2（全局快捷键 push-to-talk/浮层/托盘/设置/登录购买/反馈/首启引导）
- android：Compose 主 App + IME（键盘内录音直传）
- ios：App + 键盘扩展（1A spike 实证键盘内不可录音，走 deep link 听写）
- design/design-pipeline：设计系统 + token 导出 iOS/Android 主题
- doc：前后端设计文档（HTML）；web：官网宣传页；todo：任务看板

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

desktop/src-tauri/src/metrics.rs

@@ -0,0 +1,67 @@
+//! 客户端打点（10H）：内存队列，满 20 条或 60s 批量上报；失败丢弃不影响功能。
+
+use parking_lot::Mutex;
+use serde_json::{json, Value};
+use std::sync::Arc;
+use std::time::Duration;
+use tauri::{AppHandle, Manager};
+
+#[derive(Clone)]
+pub struct Metrics {
+    queue: Arc<Mutex<Vec<Value>>>,
+}
+
+impl Metrics {
+    pub fn record(&self, event: &str, props: Value) {
+        let mut q = self.queue.lock();
+        q.push(json!({
+            "event": event,
+            "props": props,
+            "client_ts": std::time::SystemTime::now()
+                .duration_since(std::time::UNIX_EPOCH).map(|d| d.as_millis() as i64).unwrap_or(0),
+        }));
+        if q.len() > 1000 {
+            let overflow = q.len() - 1000;
+            q.drain(..overflow); // 上限丢最旧
+        }
+    }
+}
+
+pub fn spawn(app: AppHandle) -> Metrics {
+    let m = Metrics {
+        queue: Arc::new(Mutex::new(Vec::new())),
+    };
+    let queue = m.queue.clone();
+    tauri::async_runtime::spawn(async move {
+        let client = reqwest::Client::new();
+        let mut tick = tokio::time::interval(Duration::from_secs(10));
+        loop {
+            tick.tick().await;
+            let (events, url, device_id) = {
+                let mut q = queue.lock();
+                if q.is_empty() || (q.len() < 20 && tickcount_skip(&q)) {
+                    continue;
+                }
+                let events: Vec<Value> = q.drain(..).collect();
+                let s = app.state::<crate::settings::SettingsStore>().get();
+                (events, format!("{}/v1/metrics/batch", s.server_url), s.device_id)
+            };
+            let body = json!({
+                "device_id": device_id,
+                "platform": std::env::consts::OS,
+                "app_version": env!("CARGO_PKG_VERSION"),
+                "os_version": "",
+                "events": events,
+            });
+            let _ = client.post(&url).json(&body).send().await; // 失败即丢弃
+        }
+    });
+    m
+}
+
+// 不满 20 条时按 60s 节奏（tick 10s × 6 次取模近似）上报；保持实现极简。
+fn tickcount_skip(_q: &[Value]) -> bool {
+    use std::sync::atomic::{AtomicU64, Ordering};
+    static N: AtomicU64 = AtomicU64::new(0);
+    N.fetch_add(1, Ordering::Relaxed) % 6 != 0
+}