feat(ai): 添加 Provider 管理 API 端点

GET /ai/providers — 列出已注册提供商
GET /ai/providers/health — 各提供商健康状态
GET /ai/quota/summary — 租户配额使用摘要

crates/erp-ai/src/handler/mod.rs

@@ -487,6 +487,61 @@ where
     Ok(Json(ApiResponse::ok(result)))
 }
 
+// === Provider 管理 ===
+
+pub async fn provider_health<S>(
+    State(state): State<AiState>,
+    Extension(ctx): Extension<TenantContext>,
+) -> Result<Json<ApiResponse<serde_json::Value>>, erp_core::error::AppError>
+where
+    AiState: FromRef<S>,
+    S: Clone + Send + Sync + 'static,
+{
+    require_permission(&ctx, "ai.analysis.list")?;
+    let statuses = state.provider_registry.health_check_all().await;
+    let result: serde_json::Value = statuses.iter().map(|entry| {
+        let (name, health) = entry.pair();
+        serde_json::json!({
+            "provider": name,
+            "healthy": health.is_healthy(),
+            "status": match health {
+                crate::provider::registry::ProviderHealth::Healthy { last_check } =>
+                    serde_json::json!({"status": "healthy", "last_check": last_check.to_rfc3339()}),
+                crate::provider::registry::ProviderHealth::Degraded { last_check, error } =>
+                    serde_json::json!({"status": "degraded", "last_check": last_check.to_rfc3339(), "error": error}),
+                crate::provider::registry::ProviderHealth::Unavailable { since, error } =>
+                    serde_json::json!({"status": "unavailable", "since": since.to_rfc3339(), "error": error}),
+            },
+        })
+    }).collect();
+    Ok(Json(ApiResponse::ok(result)))
+}
+
+pub async fn provider_names<S>(
+    State(state): State<AiState>,
+    Extension(ctx): Extension<TenantContext>,
+) -> Result<Json<ApiResponse<Vec<String>>>, erp_core::error::AppError>
+where
+    AiState: FromRef<S>,
+    S: Clone + Send + Sync + 'static,
+{
+    require_permission(&ctx, "ai.analysis.list")?;
+    Ok(Json(ApiResponse::ok(state.provider_registry.provider_names())))
+}
+
+pub async fn quota_summary<S>(
+    State(state): State<AiState>,
+    Extension(ctx): Extension<TenantContext>,
+) -> Result<Json<ApiResponse<crate::service::quota::QuotaSummary>>, erp_core::error::AppError>
+where
+    AiState: FromRef<S>,
+    S: Clone + Send + Sync + 'static,
+{
+    require_permission(&ctx, "ai.usage.list")?;
+    let summary = state.quota.get_usage_summary(ctx.tenant_id).await?;
+    Ok(Json(ApiResponse::ok(summary)))
+}
+
 // === 透析风险评估（KDIGO 规则） ===
 
 pub async fn assess_dialysis_risk<S>(

crates/erp-ai/src/module.rs

@@ -246,5 +246,17 @@ impl AiModule {
                 "/ai/dialysis/risk-assessment",
                 axum::routing::post(crate::handler::assess_dialysis_risk),
             )
+            .route(
+                "/ai/providers/health",
+                axum::routing::get(crate::handler::provider_health),
+            )
+            .route(
+                "/ai/providers",
+                axum::routing::get(crate::handler::provider_names),
+            )
+            .route(
+                "/ai/quota/summary",
+                axum::routing::get(crate::handler::quota_summary),
+            )
     }
 }