refactor: Create a `dify_config` with Pydantic. (#5938)

api/app.py

 import os
 
-from configs.app_config import DifyConfig
+from configs import dify_config
 
 if not os.environ.get("DEBUG") or os.environ.get("DEBUG", "false").lower() != 'true':
     from gevent import monkey
     with configs loaded from .env file
     """
     dify_app = DifyApp(__name__)
-    dify_app.config.from_mapping(DifyConfig().model_dump())
+    dify_app.config.from_mapping(dify_config.model_dump())
 
     # populate configs into system environment variables
     for key, value in dify_app.config.items():

api/commands.py

 from flask import current_app
 from werkzeug.exceptions import NotFound
 
+from configs import dify_config
 from constants.languages import languages
 from core.rag.datasource.vdb.vector_factory import Vector
 from core.rag.datasource.vdb.vector_type import VectorType
     After the reset, all LLM credentials will become invalid, requiring re-entry.
     Only support SELF_HOSTED mode.
     """
-    if current_app.config['EDITION'] != 'SELF_HOSTED':
+    if dify_config.EDITION != 'SELF_HOSTED':
         click.echo(click.style('Sorry, only support SELF_HOSTED mode.', fg='red'))
         return
 

api/configs/__init__.py

+
+from .app_config import DifyConfig
+
+dify_config = DifyConfig()