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/add_sentiment_analysis_001.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 sentiment analysis columns
+
+Revision ID: add_sentiment_analysis_001
+Revises: add_widget_apps_001
+Create Date: 2026-03-16 11:00:00.000000
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision: str = 'add_sentiment_analysis_001'
+down_revision: Union[str, None] = 'add_widget_apps_001'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    # Add sentiment columns to chat_history
+    op.add_column('chat_history', sa.Column('sentiment_label', sa.String(), nullable=True))
+    op.add_column('chat_history', sa.Column('sentiment_score', sa.Float(), nullable=True))
+
+    # Add sentiment columns to session_to_agents
+    op.add_column('session_to_agents', sa.Column('sentiment_label', sa.String(), nullable=True))
+    op.add_column('session_to_agents', sa.Column('sentiment_score', sa.Float(), nullable=True))
+
+    # Create indexes for efficient sentiment queries
+    op.create_index(
+        'ix_chat_history_sentiment_label',
+        'chat_history',
+        ['sentiment_label'],
+        unique=False
+    )
+    op.create_index(
+        'ix_session_to_agents_sentiment_label',
+        'session_to_agents',
+        ['sentiment_label'],
+        unique=False
+    )
+
+
+def downgrade() -> None:
+    op.drop_index('ix_session_to_agents_sentiment_label', table_name='session_to_agents')
+    op.drop_index('ix_chat_history_sentiment_label', table_name='chat_history')
+    op.drop_column('session_to_agents', 'sentiment_score')
+    op.drop_column('session_to_agents', 'sentiment_label')
+    op.drop_column('chat_history', 'sentiment_score')
+    op.drop_column('chat_history', 'sentiment_label')