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/7991b4fc00d8_added_wlecome_header_and_title.py

@@ -0,0 +1,51 @@
+"""
+Copyright 2024-2026 ChatterMate
+
+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 wlecome header and title 
+
+Revision ID: 7991b4fc00d8
+Revises: 6885c9f36712
+Create Date: 2025-07-27 16:11:49.392307
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision: str = '7991b4fc00d8'
+down_revision: Union[str, None] = '6885c9f36712'
+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('agent_customizations', sa.Column('welcome_title', sa.String(), nullable=True))
+    op.add_column('agent_customizations', sa.Column('welcome_subtitle', sa.String(), nullable=True))
+    # ### end Alembic commands ###
+
+
+def downgrade() -> None:
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_column('agent_customizations', 'welcome_subtitle')
+    op.drop_column('agent_customizations', 'welcome_title')
+
+
+    # ### end Alembic commands ###