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/d9a4b9902f80_add_attempts_to_otp_table.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_attempts_to_otp_table
+
+Revision ID: d9a4b9902f80
+Revises: 013174e15242
+Create Date: 2025-10-07 19:24:50.790908
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision: str = 'd9a4b9902f80'
+down_revision: Union[str, None] = '013174e15242'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    # Check if enterprise schema exists before adding column
+    # In open-source version, enterprise schema doesn't exist
+    connection = op.get_bind()
+    
+    # Check if enterprise schema exists
+    schema_exists = connection.execute(
+        sa.text("SELECT EXISTS(SELECT 1 FROM information_schema.schemata WHERE schema_name = 'enterprise')")
+    ).scalar()
+    
+    if schema_exists:
+        # Add attempts column to otps table in enterprise schema
+        op.add_column('otps', sa.Column('attempts', sa.Integer(), nullable=False, server_default='0'), schema='enterprise')
+
+
+def downgrade() -> None:
+    # Check if enterprise schema exists before removing column
+    # In open-source version, enterprise schema doesn't exist
+    connection = op.get_bind()
+    
+    # Check if enterprise schema exists
+    schema_exists = connection.execute(
+        sa.text("SELECT EXISTS(SELECT 1 FROM information_schema.schemata WHERE schema_name = 'enterprise')")
+    ).scalar()
+    
+    if schema_exists:
+        # Remove attempts column from otps table in enterprise schema
+        op.drop_column('otps', 'attempts', schema='enterprise')