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/embedded/embedded_fonts.h

@@ -26,4 +26,7 @@ extern "C" {
 
     extern const unsigned char g_material_icons_data[];
     extern const unsigned int  g_material_icons_size;
+
+    extern const unsigned char g_noto_cjk_subset_data[];
+    extern const unsigned int  g_noto_cjk_subset_size;
 }