refactor: extract provider pool abstractions

crates/aether-provider-pool/src/quota_refresh.rs

@@ -0,0 +1,19 @@
+use std::collections::BTreeMap;
+
+use serde_json::Value;
+
+#[derive(Debug, Clone, PartialEq)]
+pub struct ProviderPoolQuotaRequestSpec {
+    pub request_id: String,
+    pub provider_name: String,
+    pub quota_kind: String,
+    pub method: String,
+    pub url: String,
+    pub headers: BTreeMap<String, String>,
+    pub content_type: Option<String>,
+    pub json_body: Option<Value>,
+    pub client_api_format: String,
+    pub provider_api_format: String,
+    pub model_name: Option<String>,
+    pub accept_invalid_certs: bool,
+}