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/ff48f854bcbf_add_ticket_fields_to_session.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.
+"""
+
+"""add_ticket_fields_to_session
+
+Revision ID: ff48f854bcbf
+Revises: e65e1b8e7e3c
+Create Date: 2025-03-07 11:09:21.933786
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision: str = 'ff48f854bcbf'
+down_revision: Union[str, None] = 'e65e1b8e7e3c'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    # ### commands auto generated by Alembic - please adjust! ###
+
+    op.add_column('session_to_agents', sa.Column('ticket_id', sa.String(), nullable=True))
+    op.add_column('session_to_agents', sa.Column('ticket_status', sa.String(), nullable=True))
+    op.add_column('session_to_agents', sa.Column('ticket_summary', sa.String(), nullable=True))
+    op.add_column('session_to_agents', sa.Column('ticket_description', sa.String(), nullable=True))
+    op.add_column('session_to_agents', sa.Column('integration_type', sa.String(), nullable=True))
+    op.add_column('session_to_agents', sa.Column('ticket_priority', sa.String(), nullable=True))
+    # ### end Alembic commands ###
+
+
+def downgrade() -> None:
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_column('session_to_agents', 'ticket_priority')
+    op.drop_column('session_to_agents', 'integration_type')
+    op.drop_column('session_to_agents', 'ticket_description')
+    op.drop_column('session_to_agents', 'ticket_summary')
+    op.drop_column('session_to_agents', 'ticket_status')
+    op.drop_column('session_to_agents', 'ticket_id')
+
+    # ### end Alembic commands ###