feat: localize default strategy names by UI language at registration

- Pass `lang` from register request body to createDefaultStrategies
- Support zh/en/id locales for strategy names and descriptions
- Wrap strategy creation in a transaction to prevent partial writes
- Frontend sends current UI language in register request body
- Strategy list UI: 2-line clamp, unselected border, larger spacing, smaller font for non-zh

web/src/contexts/AuthContext.tsx

@@ -3,6 +3,7 @@ import { flushSync } from 'react-dom'
 import { getSystemConfig } from '../lib/config'
 import { reset401Flag, httpClient } from '../lib/httpClient'
 import { getPostAuthPath, setUserMode, type UserMode } from '../lib/onboarding'
+import { useLanguage } from './LanguageContext'
 
 interface User {
   id: string
@@ -41,6 +42,7 @@ interface AuthContextType {
 const AuthContext = createContext<AuthContextType | undefined>(undefined)
 
 export function AuthProvider({ children }: { children: React.ReactNode }) {
+  const { language } = useLanguage()
   const [user, setUser] = useState<User | null>(null)
   const [token, setToken] = useState<string | null>(null)
   const [isLoading, setIsLoading] = useState(true)
@@ -208,7 +210,8 @@ export function AuthProvider({ children }: { children: React.ReactNode }) {
       email: string
       password: string
       beta_code?: string
-    } = { email, password }
+      lang?: string
+    } = { email, password, lang: language }
     if (betaCode) {
       requestBody.beta_code = betaCode
     }

web/src/pages/StrategyStudioPage.tsx

@@ -706,7 +706,7 @@ export function StrategyStudioPage() {
                 </button>
               </div>
             </div>
-            <div className="space-y-1">
+            <div className="space-y-2">
               {strategies.map((strategy) => (
                 <div
                   key={strategy.id}
@@ -719,11 +719,11 @@ export function StrategyStudioPage() {
                   }}
                   className={`group px-2 py-2 rounded-lg cursor-pointer transition-all ${selectedStrategy?.id === strategy.id
                     ? 'ring-1 ring-nofx-gold/50 bg-nofx-gold/10 shadow-[0_0_15px_rgba(240,185,11,0.1)]'
-                    : 'hover:bg-nofx-bg-lighter/60 hover:ring-1 hover:ring-nofx-gold/20 bg-transparent'
+                    : 'hover:bg-nofx-bg-lighter/60 ring-1 ring-white/10 hover:ring-nofx-gold/20 bg-transparent'
                     }`}
                 >
-                  <div className="flex items-center justify-between">
-                    <span className="text-sm truncate text-nofx-text">{strategy.name}</span>
+                  <div className="flex items-start justify-between">
+                    <span className={`line-clamp-2 text-nofx-text ${language === 'zh' ? 'text-sm' : 'text-xs'}`}>{strategy.name}</span>
                     <div className="flex items-center gap-0.5 opacity-0 group-hover:opacity-100 transition-opacity">
                       <button
                         onClick={(e) => { e.stopPropagation(); handleExportStrategy(strategy) }}