feat: v0.5.0 - provider icon actions, duplicate & connectivity test, dashboard chart fixes

- ProviderList: icon buttons (edit/copy/test/delete) via lucide-react, speed-test badge before enable/switch button
- Duplicate provider: deep-copy provider + models as xxx-copy
- test_connectivity command (cc-switch semantics: GET base_url, any HTTP response = reachable), latency badge green/orange/red, auto-dismiss 6s
- Dashboard: daily bars anchored to panel bottom, Card flex height fix (heatmap stays content-height)

src/i18n/en.ts

@@ -31,6 +31,13 @@ export const enTranslations: Record<TranslationKey, string> = {
   defaultModel: "Default: {name}",
   edit: "Edit",
   delete: "Delete",
+  copyProvider: "Duplicate provider",
+  testConnectivity: "Test connectivity",
+  testing: "Testing...",
+  connectivityOk: "{name} reachable ({latency}ms)",
+  connectivitySlow: "{name} reachable but slow ({latency}ms)",
+  connectivityFail: "{name} unreachable: {error}",
+  copiedProvider: "Duplicated as {name}",
 
   // Provider edit
   editProvider: "Edit Provider",

src/i18n/zh.ts

@@ -29,6 +29,13 @@ export const zhTranslations = {
   defaultModel: "默认: {name}",
   edit: "编辑",
   delete: "删除",
+  copyProvider: "复制供应商",
+  testConnectivity: "测试连通性",
+  testing: "测试中...",
+  connectivityOk: "{name} 连通正常（{latency}ms）",
+  connectivitySlow: "{name} 连通较慢（{latency}ms）",
+  connectivityFail: "{name} 无法连通：{error}",
+  copiedProvider: "已复制为 {name}",
 
   // Provider edit
   editProvider: "编辑供应商",