feat(gateway): 重构 usage 数据层、迁移系统与系统导入

数据库迁移:
- 引入 baseline v2 bootstrap，空库首次启动自动初始化
- 服务启动不再自动执行迁移，需显式 `--migrate` 运行
- 新增 pending migration 检测，schema 落后时拒绝启动

Usage 数据层:
- usage body 存储外部化为独立 blob 表
- 新增 HTTP audit 表拆分存储请求/响应头与 body ref
- 后台清理任务支持 legacy body ref 元数据迁移
- usage runtime 写入迁移到专用 tokio runtime（独立线程池, 8MB 栈）

系统导入/导出:
- 支持用户、API Keys、钱包数据的完整导入
- 兼容 legacy 与 v1.3+ 两种导出格式

其他改进:
- executor outcome 增加 runtime miss 诊断上下文
- 主 tokio runtime 栈大小调整为 8MB
- 前端 provider 管理支持 base URL 配置
- dev.sh 支持 --migrate 参数

apps/aether-gateway/src/handlers/admin/provider/write/normalize.rs

@@ -18,6 +18,23 @@ pub(crate) fn normalize_auth_type(value: Option<&str>) -> Result<String, String>
     }
 }
 
+pub(crate) fn normalize_pool_advanced_config(
+    value: Option<serde_json::Value>,
+) -> Result<Option<serde_json::Value>, String> {
+    let Some(value) = value else {
+        return Ok(None);
+    };
+    match value {
+        serde_json::Value::Null => Ok(None),
+        // `pool_advanced: {}` still means "enable pool mode with defaults".
+        serde_json::Value::Object(map) => Ok(Some(serde_json::Value::Object(map))),
+        // Backward compatibility for older boolean payloads.
+        serde_json::Value::Bool(true) => Ok(Some(serde_json::json!({}))),
+        serde_json::Value::Bool(false) => Ok(None),
+        _ => Err("pool_advanced 必须是 JSON 对象".to_string()),
+    }
+}
+
 pub(crate) fn validate_vertex_api_formats(
     provider_type: &str,
     auth_type: &str,
@@ -46,3 +63,29 @@ pub(crate) fn validate_vertex_api_formats(
         allowed.join(", ")
     ))
 }
+
+#[cfg(test)]
+mod tests {
+    use super::normalize_pool_advanced_config;
+    use serde_json::json;
+
+    #[test]
+    fn normalize_pool_advanced_preserves_empty_object() {
+        assert_eq!(
+            normalize_pool_advanced_config(Some(json!({}))).expect("empty object should normalize"),
+            Some(json!({}))
+        );
+    }
+
+    #[test]
+    fn normalize_pool_advanced_accepts_legacy_booleans() {
+        assert_eq!(
+            normalize_pool_advanced_config(Some(json!(true))).expect("true should normalize"),
+            Some(json!({}))
+        );
+        assert_eq!(
+            normalize_pool_advanced_config(Some(json!(false))).expect("false should normalize"),
+            None
+        );
+    }
+}

apps/aether-gateway/src/handlers/admin/provider/write/provider/create.rs

@@ -2,7 +2,9 @@ use crate::handlers::admin::provider::shared::payloads::AdminProviderCreateReque
 use crate::handlers::admin::provider::shared::support::{
     normalize_provider_billing_type, parse_optional_rfc3339_unix_secs,
 };
-use crate::handlers::admin::provider::write::normalize::normalize_provider_type_input;
+use crate::handlers::admin::provider::write::normalize::{
+    normalize_pool_advanced_config, normalize_provider_type_input,
+};
 use crate::handlers::admin::request::AdminAppState;
 use crate::handlers::admin::shared::normalize_json_object;
 use aether_data_contracts::repository::provider_catalog::StoredProviderCatalogProvider;
@@ -118,7 +120,7 @@ pub(crate) async fn build_admin_create_provider_record(
     let mut config_map = normalize_json_object(payload.config, "config")?
         .and_then(|value| value.as_object().cloned())
         .unwrap_or_default();
-    if let Some(value) = normalize_json_object(payload.pool_advanced, "pool_advanced")? {
+    if let Some(value) = normalize_pool_advanced_config(payload.pool_advanced)? {
         config_map.insert("pool_advanced".to_string(), value);
     }
     if let Some(value) = normalize_json_object(payload.failover_rules, "failover_rules")? {

apps/aether-gateway/src/handlers/admin/provider/write/provider/update.rs

@@ -2,7 +2,9 @@ use crate::handlers::admin::provider::shared::payloads::AdminProviderUpdatePatch
 use crate::handlers::admin::provider::shared::support::{
     normalize_provider_billing_type, parse_optional_rfc3339_unix_secs,
 };
-use crate::handlers::admin::provider::write::normalize::normalize_provider_type_input;
+use crate::handlers::admin::provider::write::normalize::{
+    normalize_pool_advanced_config, normalize_provider_type_input,
+};
 use crate::handlers::admin::request::AdminAppState;
 use crate::handlers::admin::shared::normalize_json_object;
 use aether_data_contracts::repository::provider_catalog::StoredProviderCatalogProvider;
@@ -252,7 +254,7 @@ pub(crate) async fn build_admin_update_provider_record(
         if fields.is_null("pool_advanced") {
             config_map.remove("pool_advanced");
         } else {
-            let value = normalize_json_object(payload.pool_advanced, "pool_advanced")?
+            let value = normalize_pool_advanced_config(payload.pool_advanced)?
                 .ok_or_else(|| "pool_advanced 必须是 JSON 对象".to_string())?;
             config_map.insert("pool_advanced".to_string(), value);
         }