feat: macOS architecture, cloud ASR/LLM providers, and 6-step iOS onboarding

- Add macOS menu-bar dictation app with local ASR models (SenseVoice/Qwen3),
  global Option hotkey, and bottom overlay
- Add cloud ASR/LLM providers (Anthropic, Volcengine, Bailian, and more) with
  provider logos, model listing, and connection checks
- Add shared 7-day usage stats UI (UsageStatsCluster / SevenDayUsageChart)
- Add iOS onboarding step 6 for polish LLM setup; hide custom-language-model
  diagnostic toggle behind DEBUG
- Unify iOS onboarding tagline with the macOS brand line ("开口即文字。")
- Rewrite README (Chinese-first, product-oriented) and refresh GitHub Pages

OSGKeyboardShared/Models/ProviderLogo.swift

@@ -10,12 +10,24 @@ public enum ProviderLogo {
     /// Asset name for the provider's logo, or `nil` when there is no bundled logo.
     public static func assetName(for providerId: String) -> String? {
         switch providerId {
-        case "openai": return "openai"
+        case "openai", "whisper": return "openai"
         case "deepseek": return "deepseek"
-        case "qwen": return "qwen"
+        case "qwen", "bailian", "alibabaCoding": return "qwen"
         case "moonshot": return "moonshot"
         case "zhipu": return "zhipu"
         case "mimo": return "mimo"
+        case "ark", "volcengine": return "ark"
+        case "siliconflow": return "siliconflow"
+        case "groq": return "groq"
+        case "minimax": return "minimax"
+        case "openrouter": return "openrouter"
+        case "gemini": return "gemini"
+        case "anthropic": return "anthropic"
+        case "xai": return "xai"
+        case "mistral": return "mistral"
+        case "cometapi": return "cometapi"
+        case "codingPlanX": return "codingplanx"
+        case "codex_oauth": return "openai"
         case "apple": return "apple"
         case "custom": return "custom"
         default: return nil