feat: i18n full support, responsive UI, multi-model AI config, and bug fixes

Major Features:
- Internationalization (i18n) with auto-detection for ES/EN/PT
- Mobile-first responsive design for Studio and Experience
- Multi-model AI configuration (llama3.2:3b, qwen3.5:9b, gpt-oss:latest)
- Course language configuration (auto-detect or fixed per course)

Backend Changes:
- shared/common: ModelType enum for intelligent model selection
- LMS: log_ai_usage function migration (fix chat tutor 500 error)
- LMS/CMS: course language config fields (language_setting, fixed_language)
- LMS: /courses/{id}/language-config endpoint for language detection

Frontend Changes:
- Experience: Enhanced i18n with browser language detection
- Experience: Audio recording with HTTPS check and error handling
- Studio: Memory game with unique pair IDs and debug logging
- Studio: Expanded translations (250+ keys for ES, EN, PT)
- Both: Language selector in headers (mobile responsive)

Documentation:
- AI_MODELS_CONFIG.md: Multi-model configuration guide
- RESPONSIVIDAD_GUIA.md: Mobile-first design patterns
- I18N_RESPONSIVIDAD_IMPLEMENTACION.md: Implementation details
- DEBUG_AUDIO_RECORDING.md: Audio troubleshooting guide
- DEBUG_MEMORY_GAME.md: Memory game debugging steps

Bug Fixes:
- Fix chat tutor 500 error (missing log_ai_usage function)
- Fix audio recording (HTTPS check, browser compatibility)
- Fix memory game pair IDs (unique ID generation)
- Fix HotspotBlock TypeScript errors

Co-authored-by: Qwen-Coder <qwen-coder@alibabacloud.com>

services/cms-service/src/main.rs

@@ -96,8 +96,18 @@ async fn main() {
         }
     });
 
+    // CORS configuration - Allow multiple origins for development and production
     let cors = CorsLayer::new()
-        .allow_origin("http://localhost:3000".parse::<http::HeaderValue>().unwrap())
+        .allow_origin([
+            "http://localhost:3000".parse::<http::HeaderValue>().unwrap(),
+            "http://localhost:3003".parse::<http::HeaderValue>().unwrap(),
+            "http://127.0.0.1:3000".parse::<http::HeaderValue>().unwrap(),
+            "http://127.0.0.1:3003".parse::<http::HeaderValue>().unwrap(),
+            "http://192.168.0.254:3000".parse::<http::HeaderValue>().unwrap(),
+            "http://192.168.0.254:3003".parse::<http::HeaderValue>().unwrap(),
+            // Allow any origin for development (remove in production)
+            "http://192.168.0.254".parse::<http::HeaderValue>().unwrap(),
+        ])
         .allow_methods([Method::GET, Method::POST, Method::PUT, Method::DELETE, Method::OPTIONS, Method::PATCH])
         .allow_headers([
             header::CONTENT_TYPE,