Initial commit: import from sinmb79/Gov-chat-bot

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/app/providers/local_embedding.py

@@ -0,0 +1,32 @@
+from __future__ import annotations
+
+from app.providers.embedding import EmbeddingProvider
+
+import app.providers as providers_module
+
+
+class LocalEmbeddingProvider(EmbeddingProvider):
+    """
+    jhgan/ko-sroberta-multitask 기반 로컬 임베딩.
+    sentence-transformers 패키지 필요.
+    """
+
+    def __init__(self, model_name: str = "jhgan/ko-sroberta-multitask"):
+        self.model_name = model_name
+        self._model = None
+
+    async def warmup(self) -> None:
+        """모델 로드. 최초 1회 실행."""
+        from sentence_transformers import SentenceTransformer
+        self._model = SentenceTransformer(self.model_name)
+        providers_module._embedding_warmed_up = True
+
+    async def embed(self, texts: list[str]) -> list[list[float]]:
+        if self._model is None:
+            await self.warmup()
+        embeddings = self._model.encode(texts, convert_to_numpy=True)
+        return embeddings.tolist()
+
+    @property
+    def dimension(self) -> int:
+        return 768