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/agent_quick_replies_001.py

@@ -0,0 +1,30 @@
+"""Let an agent offer reply buttons on messaging channels
+
+Off by default: an agent shows the AI's choices as tappable buttons on
+WhatsApp, Messenger, Instagram and Telegram only once someone turns it on.
+
+Revision ID: agent_quick_replies_001
+Revises: chat_channel_status_001
+Create Date: 2026-10-11
+"""
+from typing import Sequence, Union
+
+import sqlalchemy as sa
+from alembic import op
+
+# revision identifiers, used by Alembic.
+# Keep revision ids under 32 characters: alembic_version.version_num is
+# varchar(32).
+revision: str = 'agent_quick_replies_001'
+down_revision: Union[str, None] = 'chat_channel_status_001'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    op.add_column('agents', sa.Column('channel_quick_replies', sa.Boolean(), nullable=False,
+                                      server_default=sa.false()), if_not_exists=True)
+
+
+def downgrade() -> None:
+    op.drop_column('agents', 'channel_quick_replies', if_exists=True)