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_openai_compat_ai_model_001.py

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+"""
+Copyright 2024-2026 ReplyPier
+
+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 OPENAI_COMPATIBLE AI model type
+
+Revision ID: add_openai_compat_ai_model_001
+Revises: fcm_tokens_per_device_001
+Create Date: 2026-09-03 00:00:00.000000
+
+"""
+from typing import Sequence, Union
+from alembic import op
+
+# revision identifiers, used by Alembic.
+revision: str = 'add_openai_compat_ai_model_001'
+down_revision: Union[str, None] = 'fcm_tokens_per_device_001'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    op.execute("ALTER TYPE aimodeltype ADD VALUE IF NOT EXISTS 'OPENAI_COMPATIBLE'")
+
+
+def downgrade() -> None:
+    # PostgreSQL does not support removing enum values
+    pass