feat: Full UI internationalization, pool hashrate stats, and layout caching

- Replace all hardcoded English strings with TR() translation keys across
  every tab, dialog, and component (~20 UI files)
- Expand all 8 language files (de, es, fr, ja, ko, pt, ru, zh) with
  complete translations (~37k lines added)
- Improve i18n loader with exe-relative path fallback and English base
  fallback for missing keys
- Add pool-side hashrate polling via pool stats API in xmrig_manager
- Introduce Layout::beginFrame() per-frame caching and refresh balance
  layout config only on schema generation change
- Offload daemon output parsing to worker thread
- Add CJK subset fallback font for Chinese/Japanese/Korean glyphs

src/daemon/xmrig_manager.cpp

@@ -244,6 +244,18 @@ bool XmrigManager::start(const Config& cfg) {
     }
     stats_ = PoolStats{};
 
+    // Extract pool hostname for stats API queries
+    {
+        std::string url = cfg.pool_url;
+        // Strip protocol prefix if present
+        auto pos = url.find("://");
+        if (pos != std::string::npos) url = url.substr(pos + 3);
+        // Strip port suffix
+        pos = url.find(':');
+        if (pos != std::string::npos) url = url.substr(0, pos);
+        pool_host_ = url;
+    }
+
     // Find binary
     std::string binary = findXmrigBinary();
     if (binary.empty()) {
@@ -572,6 +584,7 @@ void XmrigManager::monitorProcess() {
     }
 
     int poll_counter = 0;
+    int pool_api_counter = 0;
     while (!should_stop_) {
         drainOutput();
 
@@ -605,6 +618,12 @@ void XmrigManager::monitorProcess() {
             fetchStatsHttp();
         }
 
+        // Poll pool-side stats every ~30 seconds (300 * 100ms)
+        if (++pool_api_counter >= 300) {
+            pool_api_counter = 0;
+            fetchPoolApiStats();
+        }
+
         std::this_thread::sleep_for(std::chrono::milliseconds(100));
     }
     drainOutput(); // Final drain
@@ -711,5 +730,53 @@ void XmrigManager::fetchStatsHttp() {
     }
 }
 
+// ============================================================================
+// Pool-side stats (hashrate reported by the pool)
+// ============================================================================
+
+void XmrigManager::fetchPoolApiStats() {
+    if (state_ != State::Running || pool_host_.empty()) return;
+
+    // Query the pool's public stats API
+    std::string url = "https://" + pool_host_ + "/api/stats";
+    std::string responseData;
+
+    CURL* curl = curl_easy_init();
+    if (!curl) return;
+
+    curl_easy_setopt(curl, CURLOPT_URL, url.c_str());
+    curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, curlWriteCb);
+    curl_easy_setopt(curl, CURLOPT_WRITEDATA, &responseData);
+    curl_easy_setopt(curl, CURLOPT_TIMEOUT_MS, 5000L);
+    curl_easy_setopt(curl, CURLOPT_CONNECTTIMEOUT_MS, 3000L);
+    curl_easy_setopt(curl, CURLOPT_NOSIGNAL, 1L);
+    curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1L);
+
+    CURLcode res = curl_easy_perform(curl);
+    curl_easy_cleanup(curl);
+
+    if (res != CURLE_OK) return;
+
+    try {
+        json resp = json::parse(responseData);
+
+        // Pool stats API format: { "pools": { "<name>": { "hashrate": ... } } }
+        double poolHR = 0;
+        if (resp.contains("pools") && resp["pools"].is_object()) {
+            for (auto& [key, pool] : resp["pools"].items()) {
+                if (pool.contains("hashrate") && pool["hashrate"].is_number()) {
+                    poolHR = pool["hashrate"].get<double>();
+                    break;  // Use the first pool entry
+                }
+            }
+        }
+
+        std::lock_guard<std::mutex> lk(stats_mutex_);
+        stats_.pool_hashrate = poolHR;
+    } catch (...) {
+        // Malformed response — ignore
+    }
+}
+
 } // namespace daemon
 } // namespace dragonx