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

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

backend/app/providers/embedding.py

@@ -0,0 +1,30 @@
+from abc import ABC, abstractmethod
+
+
+class EmbeddingProvider(ABC):
+    @abstractmethod
+    async def embed(self, texts: list[str]) -> list[list[float]]:
+        ...
+
+    @abstractmethod
+    async def warmup(self) -> None:
+        ...
+
+    @property
+    @abstractmethod
+    def dimension(self) -> int:
+        ...
+
+
+class NotImplementedEmbeddingProvider(EmbeddingProvider):
+    """Phase 1에서 LocalEmbeddingProvider로 교체 예정"""
+
+    async def embed(self, texts: list[str]) -> list:
+        raise NotImplementedError("Embedding provider not configured. Set EMBEDDING_PROVIDER.")
+
+    async def warmup(self) -> None:
+        pass  # 예외 없이 통과
+
+    @property
+    def dimension(self) -> int:
+        return 768