build: 打通 FastAPI 与 Vue 最小工程、依赖与数据库连接

后端入口、配置、Redis 与 Alembic 迁移就位；前端 Vite 工程可安装可构建。

backend/alembic/versions/537f2b7d4a7c_added_end_chat_support.py

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+"""
+Copyright 2024-2026 ReplyPier
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+"""
+
+"""added end chat support
+
+Revision ID: 537f2b7d4a7c
+Revises: 5b5f936cd9e4
+Create Date: 2025-03-04 12:07:37.679734
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+from sqlalchemy.dialects import postgresql
+
+# revision identifiers, used by Alembic.
+revision: str = '537f2b7d4a7c'
+down_revision: Union[str, None] = '5b5f936cd9e4'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    # Create the enum type first
+    end_chat_reason_type = postgresql.ENUM(
+        'ISSUE_RESOLVED',
+        'CUSTOMER_REQUEST',
+        'CONFIRMATION_RECEIVED',
+        'FAREWELL',
+        'THANK_YOU',
+        'NATURAL_CONCLUSION',
+        'TASK_COMPLETED',
+        name='endchatreasontype'
+    )
+    end_chat_reason_type.create(op.get_bind())
+
+    # Add columns
+    op.add_column('agents', sa.Column('ask_for_rating', sa.Boolean(), server_default='true', nullable=False))
+    op.add_column('session_to_agents', sa.Column('end_chat_reason', postgresql.ENUM('ISSUE_RESOLVED', 'CUSTOMER_REQUEST', 'CONFIRMATION_RECEIVED', 'FAREWELL', 'THANK_YOU', 'NATURAL_CONCLUSION', 'TASK_COMPLETED', name='endchatreasontype'), nullable=True))
+    op.add_column('session_to_agents', sa.Column('end_chat_description', sa.String(), nullable=True))
+    op.drop_column('session_to_agents', 'closed_at')
+    # ### end Alembic commands ###
+
+
+def downgrade() -> None:
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.add_column('session_to_agents', sa.Column('closed_at', postgresql.TIMESTAMP(timezone=True), autoincrement=False, nullable=True))
+    op.drop_column('session_to_agents', 'end_chat_description')
+    op.drop_column('session_to_agents', 'end_chat_reason')
+    op.drop_column('agents', 'ask_for_rating')
+
+    # Drop the enum type
+    op.execute('DROP TYPE endchatreasontype')