refactor: extract vdb configs into pydantic-setting based dify configs (#5426)

api/configs/middleware/vdb/tidb_vector_configs.py

@@ -0,0 +1,34 @@
+from typing import Optional
+
+from pydantic import BaseModel, Field, PositiveInt
+
+
+class TiDBVectorConfigs(BaseModel):
+    """
+    TiDB Vector configs
+    """
+
+    TIDB_VECTOR_HOST: Optional[str] = Field(
+        description='TiDB Vector host',
+        default=None,
+    )
+
+    TIDB_VECTOR_PORT: Optional[PositiveInt] = Field(
+        description='TiDB Vector port',
+        default=None,
+    )
+
+    TIDB_VECTOR_USER: Optional[str] = Field(
+        description='TiDB Vector user',
+        default=None,
+    )
+
+    TIDB_VECTOR_PASSWORD: Optional[str] = Field(
+        description='TiDB Vector password',
+        default=None,
+    )
+
+    TIDB_VECTOR_DATABASE: Optional[str] = Field(
+        description='TiDB Vector database',
+        default=None,
+    )