feat:add blueprints

backend/blueprints/badge/__init__.py

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+from flask import Blueprint
+
+badge = Blueprint('badge', __name__)

backend/blueprints/chat/__init__.py

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+from flask import Blueprint
+
+chat = Blueprint('chat', __name__)

backend/blueprints/course/__init__.py

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+from flask import Blueprint
+
+course = Blueprint('course', __name__)

backend/blueprints/notification/__init__.py

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+from flask import Blueprint
+
+notification = Blueprint('notification', __name__)