feat: unify multimodels translation providers, remove self-hosting (Ollama/LibreTranslate), and fix local SQLite configuration

ARCHITECTURE.md

@@ -41,8 +41,8 @@
                       │
         ┌─────────────┼─────────────┐
         ▼             ▼             ▼
-   Google        DeepL         LibreTranslate
-  Translate    (API Key)      (Self-hosted)
+     Google         DeepL        Cloud LLMs
+    Translate     (API Key)   (OpenAI, DeepSeek...)
 ```
 
 ## Component Breakdown
@@ -126,10 +126,10 @@ Output: Translated .pptx with identical design
    - Better context understanding
    - Requires paid API key
 
-3. **LibreTranslate** (Self-hosted)
-   - Open-source alternative
-   - Full control and privacy
-   - Requires local installation
+3. **Cloud LLMs** (OpenAI, DeepSeek, OpenRouter, Minimax, Zai)
+   - Custom translation prompts support (glossary, style preservation)
+   - Contextual understanding and formatting preservation
+   - Requires respective API keys
 
 ### 4. Utility Layer