Better handling of unexpected pool stats responses, add CKPool

src/lib/mining_pool/ckpool/ckpool.cpp

@@ -0,0 +1,47 @@
+#include "ckpool.hpp"
+
+void CKPool::prepareRequest(HTTPClient &http) const
+{
+    // Empty as CKPool doesn't need special headers
+}
+
+std::string CKPool::getApiUrl() const
+{
+    return getBaseUrl() + "/users/" + poolUser;
+}
+
+PoolStats CKPool::parseResponse(const JsonDocument &doc) const
+{
+    try
+    {
+        std::string hashrateStr = doc["hashrate1m"].as<std::string>();
+        
+        // Special case for "0"
+        if (hashrateStr == "0") {
+            return PoolStats{
+                .hashrate = "0",
+                .dailyEarnings = std::nullopt
+            };
+        }
+
+        char unit = hashrateStr.back();
+        std::string value = hashrateStr.substr(0, hashrateStr.size() - 1);
+
+        int multiplier = getHashrateMultiplier(unit);
+        double hashrate = std::stod(value) * std::pow(10, multiplier);
+
+        char buffer[32];
+        snprintf(buffer, sizeof(buffer), "%.0f", hashrate);
+
+        return PoolStats{
+            .hashrate = buffer,
+            .dailyEarnings = std::nullopt};
+    }
+    catch (const std::exception &e)
+    {
+        Serial.printf("Error parsing %s response: %s\n", getPoolName().c_str(), e.what());
+        return PoolStats{
+            .hashrate = "0",
+            .dailyEarnings = std::nullopt};
+    }
+}