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/e3f4a5b6c7d8_add_aurora_chat_style.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 AURORA chat style to agent_customizations
+
+Adds the new AURORA value to the `chatstyle` enum (a dark "ask-me-anything"
+design with a gradient orb avatar). The orb-vs-photo avatar choice is stored in
+the existing `customization_metadata` JSON column, so no schema change is needed
+for that.
+
+Revision ID: e3f4a5b6c7d8
+Revises: d2e3f4a5b6c7
+Create Date: 2026-06-29 00:00:00.000000
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+
+
+# revision identifiers, used by Alembic.
+revision: str = 'e3f4a5b6c7d8'
+down_revision: Union[str, None] = 'd2e3f4a5b6c7'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    bind = op.get_bind()
+
+    # Add the new value to the native Postgres `chatstyle` enum. ALTER TYPE ...
+    # ADD VALUE cannot run inside a transaction block, so use an autocommit block.
+    if bind.dialect.name == "postgresql":
+        with op.get_context().autocommit_block():
+            op.execute("ALTER TYPE chatstyle ADD VALUE IF NOT EXISTS 'AURORA'")
+
+
+def downgrade() -> None:
+    # Postgres cannot cleanly drop individual enum values; the added chatstyle
+    # value is intentionally left in place.
+    pass