feat: Iteration 3 — 咨询轮询、统计概览、埋点后端

- consultation_service 支持 after_id 增量消息查询
- 小程序咨询详情页 8 秒轮询新消息
- 新增 DashboardStatsResp 综合统计端点 (/statistics/dashboard)
- 新增 /analytics/batch 埋点接收端点（日志记录模式）

crates/erp-server/src/handlers/analytics.rs

@@ -0,0 +1,34 @@
+use axum::Json;
+use serde::Deserialize;
+use tracing;
+
+use erp_core::types::ApiResponse;
+
+#[derive(Debug, Deserialize)]
+pub struct AnalyticsEvent {
+    pub event: String,
+    pub properties: Option<serde_json::Value>,
+    pub timestamp: Option<String>,
+    pub page: Option<String>,
+}
+
+#[derive(Debug, Deserialize)]
+pub struct BatchRequest {
+    pub events: Vec<AnalyticsEvent>,
+}
+
+/// 接收小程序批量埋点事件。
+/// 当前为日志记录模式 — 后续可接入 ClickHouse/PostgreSQL 分析表。
+pub async fn batch(
+    Json(req): Json<BatchRequest>,
+) -> Json<ApiResponse<()>> {
+    for evt in &req.events {
+        tracing::info!(
+            event = %evt.event,
+            page = ?evt.page,
+            properties = ?evt.properties,
+            "Analytics event received"
+        );
+    }
+    Json(ApiResponse::ok(()))
+}

crates/erp-server/src/handlers/mod.rs

@@ -1,3 +1,4 @@
+pub mod analytics;
 pub mod audit_log;
 pub mod crypto_admin;
 pub mod health;

crates/erp-server/src/main.rs

@@ -494,6 +494,10 @@ async fn main() -> anyhow::Result<()> {
             "/docs/openapi.json",
             axum::routing::get(handlers::openapi::openapi_spec),
         )
+        .route(
+            "/analytics/batch",
+            axum::routing::post(handlers::analytics::batch),
+        )
         .layer(axum::middleware::from_fn_with_state(
             state.clone(),
             middleware::rate_limit::rate_limit_by_ip,