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/b2c3d4e5f6a7_add_customer_meta_data.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 meta_data column to customers
+
+Adds:
+- `meta_data` (JSON): arbitrary integrator-supplied fields (e.g. student_name,
+  center_name) passed via POST /generate-token's `custom_data`, surfaced to agents
+  in the chat inbox.
+
+Revision ID: b2c3d4e5f6a7
+Revises: f4a5b6c7d8e9
+Create Date: 2026-07-06 00:00:00.000000
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision: str = 'b2c3d4e5f6a7'
+down_revision: Union[str, None] = 'f4a5b6c7d8e9'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    op.add_column(
+        'customers',
+        sa.Column('meta_data', sa.JSON(), nullable=True)
+    )
+
+
+def downgrade() -> None:
+    op.drop_column('customers', 'meta_data')