feat(stream-check): enhance health check with configurable prompt and CLI-compatible requests (#623)

- Add configurable test prompt field to StreamCheckConfig
- Implement Claude CLI-compatible request format with proper headers:
  - Authorization + x-api-key dual auth
  - anthropic-beta, anthropic-version headers
  - x-stainless-* SDK headers with dynamic OS/arch detection
  - URL with ?beta=true parameter
- Implement Codex CLI-compatible Responses API format:
  - /v1/responses endpoint
  - input array format with reasoning effort support
  - codex_cli_rs user-agent and originator headers
- Add dynamic OS name and CPU architecture detection
- Internationalize error messages (Chinese -> English)
- Add test prompt Textarea UI component with i18n support
- Remove obsolete testPromptDesc translation key

src/i18n/locales/en.json

@@ -1192,7 +1192,8 @@
     "checkParams": "Check Parameters",
     "timeout": "Timeout (seconds)",
     "maxRetries": "Max Retries",
-    "degradedThreshold": "Degraded Threshold (ms)"
+    "degradedThreshold": "Degraded Threshold (ms)",
+    "testPrompt": "Test Prompt"
   },
   "proxyConfig": {
     "proxyEnabled": "Proxy Enabled",

src/i18n/locales/ja.json

@@ -1186,7 +1186,8 @@
     "checkParams": "チェックパラメーター",
     "timeout": "タイムアウト（秒）",
     "maxRetries": "最大リトライ回数",
-    "degradedThreshold": "劣化しきい値（ミリ秒）"
+    "degradedThreshold": "劣化しきい値（ミリ秒）",
+    "testPrompt": "テストプロンプト"
   },
   "proxyConfig": {
     "proxyEnabled": "プロキシ有効",

src/i18n/locales/zh.json

@@ -1192,7 +1192,8 @@
     "checkParams": "检查参数",
     "timeout": "超时时间（秒）",
     "maxRetries": "最大重试次数",
-    "degradedThreshold": "降级阈值（毫秒）"
+    "degradedThreshold": "降级阈值（毫秒）",
+    "testPrompt": "检查提示词"
   },
   "proxyConfig": {
     "proxyEnabled": "代理总开关",