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/drop_slack_tables_001.py

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+"""
+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.
+"""
+
+"""Drop legacy Slack tables — Slack now runs on the unified channel stack
+
+Revision ID: drop_slack_tables_001
+Revises: add_channel_tables_001
+Create Date: 2026-07-10 22:00:00.000000
+
+The old integration (slack_tokens with plaintext tokens, per-thread
+slack_conversations, per-channel agent_slack_configs, workspace storage modes)
+is replaced by channel_accounts / channel_conversations / agent_channel_configs.
+The old integration had no production users, so no data is migrated. Downgrade
+recreates empty tables via the original add_slack_integration_001 shapes.
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision: str = 'drop_slack_tables_001'
+down_revision: Union[str, None] = 'add_channel_tables_001'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+_TABLES = ('slack_conversations', 'agent_slack_configs', 'slack_workspace_configs', 'slack_tokens')
+
+
+def upgrade() -> None:
+    for table in _TABLES:
+        op.execute(f'DROP TABLE IF EXISTS {table} CASCADE')
+    op.execute('DROP TYPE IF EXISTS storagemode')
+
+
+def downgrade() -> None:
+    # Recreate empty legacy tables by re-running the original migration's DDL.
+    # Version scripts aren't importable by module name — load by file path.
+    import importlib.util
+    import os
+    legacy_path = os.path.join(os.path.dirname(__file__), 'add_slack_integration_001.py')
+    spec = importlib.util.spec_from_file_location('add_slack_integration_001', legacy_path)
+    legacy = importlib.util.module_from_spec(spec)
+    spec.loader.exec_module(legacy)
+    legacy.upgrade()