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/abc123456789_add_file_attachments_table.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_file_attachments_table
+
+Revision ID: abc123456789
+Revises: 0cf34ff05aee
+Create Date: 2025-10-30 00:00:00.000000
+
+"""
+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 = 'abc123456789'
+down_revision: Union[str, None] = '0cf34ff05aee'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    # Create file_attachments table
+    op.create_table('file_attachments',
+        sa.Column('id', sa.Integer(), nullable=False),
+        sa.Column('file_url', sa.String(), nullable=False),
+        sa.Column('filename', sa.String(), nullable=False),
+        sa.Column('content_type', sa.String(), nullable=False),
+        sa.Column('file_size', sa.BigInteger(), nullable=False),
+        sa.Column('chat_history_id', sa.Integer(), nullable=True),
+        sa.Column('organization_id', postgresql.UUID(as_uuid=True), nullable=False),
+        sa.Column('uploaded_by_user_id', postgresql.UUID(as_uuid=True), nullable=True),
+        sa.Column('uploaded_by_customer_id', postgresql.UUID(as_uuid=True), nullable=True),
+        sa.Column('created_at', sa.TIMESTAMP(timezone=True), server_default=sa.text('now()'), nullable=True),
+        sa.Column('updated_at', sa.TIMESTAMP(timezone=True), server_default=sa.text('now()'), nullable=True),
+        sa.ForeignKeyConstraint(['chat_history_id'], ['chat_history.id'], ondelete='CASCADE'),
+        sa.ForeignKeyConstraint(['organization_id'], ['organizations.id'], ondelete='CASCADE'),
+        sa.ForeignKeyConstraint(['uploaded_by_user_id'], ['users.id'], ondelete='SET NULL'),
+        sa.ForeignKeyConstraint(['uploaded_by_customer_id'], ['customers.id'], ondelete='SET NULL'),
+        sa.PrimaryKeyConstraint('id')
+    )
+    op.create_index(op.f('ix_file_attachments_id'), 'file_attachments', ['id'], unique=False)
+
+
+def downgrade() -> None:
+    # Drop the table and index
+    op.drop_index(op.f('ix_file_attachments_id'), table_name='file_attachments')
+    op.drop_table('file_attachments')