feat: introduce pydantic-settings for config definition and validation (#5202)

Co-authored-by: -LAN- <laipz8200@outlook.com>

api/configs/enterprise/__init__.py

@@ -0,0 +1,18 @@
+from pydantic import BaseModel, Field
+
+
+class EnterpriseFeatureConfigs(BaseModel):
+    """
+    Enterprise feature configs.
+    **Before using, please contact business@dify.ai by email to inquire about licensing matters.**
+    """
+    ENTERPRISE_ENABLED: bool = Field(
+        description='whether to enable enterprise features.'
+                    'Before using, please contact business@dify.ai by email to inquire about licensing matters.',
+        default=False,
+    )
+
+    CAN_REPLACE_LOGO: bool = Field(
+        description='whether to allow replacing enterprise logo.',
+        default=False,
+    )