first commit

backend/app/services/llm/__init__.py

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+# LLM providers
+from app.services.llm.base import BaseLLMProvider
+from app.services.llm.router import get_llm_provider
+from app.services.llm.openai_vision import OpenAIVisionProvider
+from app.services.llm.claude_vision import ClaudeVisionProvider
+from app.services.llm.deepseek_vision import DeepSeekVisionProvider
+from app.services.llm.custom_openai_vision import CustomOpenAICompatibleProvider
+
+__all__ = [
+    "BaseLLMProvider",
+    "get_llm_provider",
+    "OpenAIVisionProvider",
+    "ClaudeVisionProvider",
+    "DeepSeekVisionProvider",
+    "CustomOpenAICompatibleProvider",
+]