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/add_widget_apps_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.
+"""
+
+"""Add widget_apps table
+
+Revision ID: add_widget_apps_001
+Revises: 2381319791e8
+Create Date: 2026-01-13 00:00:00.000000
+
+"""
+from typing import Sequence, Union
+from alembic import op
+import sqlalchemy as sa
+from sqlalchemy.dialects.postgresql import UUID
+
+
+# revision identifiers, used by Alembic.
+revision: str = 'add_widget_apps_001'
+down_revision: Union[str, Sequence[str]] = '2381319791e8'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    # Create widget_apps table
+    op.create_table(
+        'widget_apps',
+        sa.Column('id', UUID(as_uuid=True), primary_key=True, nullable=False),
+        sa.Column('name', sa.String(), nullable=False),
+        sa.Column('description', sa.Text(), nullable=True),
+        sa.Column('organization_id', UUID(as_uuid=True), nullable=False),
+        sa.Column('api_key_hash', sa.String(), nullable=False),
+        sa.Column('created_by', UUID(as_uuid=True), nullable=False),
+        sa.Column('is_active', sa.Boolean(), nullable=False, server_default='true'),
+        sa.Column('created_at', sa.DateTime(timezone=True), server_default=sa.func.now(), nullable=False),
+        sa.Column('updated_at', sa.DateTime(timezone=True), server_default=sa.func.now(), onupdate=sa.func.now(), nullable=False),
+        sa.ForeignKeyConstraint(['organization_id'], ['organizations.id']),
+        sa.ForeignKeyConstraint(['created_by'], ['users.id']),
+    )
+
+    # Create indexes
+    op.create_index('ix_widget_apps_id', 'widget_apps', ['id'])
+    op.create_index('ix_widget_apps_organization_id', 'widget_apps', ['organization_id'])
+    op.create_index('ix_widget_apps_is_active', 'widget_apps', ['is_active'])
+
+
+def downgrade() -> None:
+    # Drop indexes
+    op.drop_index('ix_widget_apps_is_active', table_name='widget_apps')
+    op.drop_index('ix_widget_apps_organization_id', table_name='widget_apps')
+    op.drop_index('ix_widget_apps_id', table_name='widget_apps')
+
+    # Drop table
+    op.drop_table('widget_apps')