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_agent_guardrail_prompt_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 agents.guardrail_prompt and agents.guardrail_enabled
+
+Revision ID: add_agent_guardrail_prompt_001
+Revises: add_guardrails_layer_001
+Create Date: 2026-07-31
+
+Makes the agent's scope rule tenant-editable. A code-owned topic list is a
+guess about what a business is NOT — the shipped wording refused maths problems
+for a maths tutor and algorithm questions for a coding bootcamp, i.e. their core
+use case. guardrail_prompt NULL means "use the platform default", so the default
+wording can still be improved centrally without rewriting existing rows.
+guardrail_enabled defaults true so every existing agent keeps its protection.
+"""
+from alembic import op
+import sqlalchemy as sa
+
+# revision identifiers, used by Alembic.
+revision = 'add_agent_guardrail_prompt_001'
+down_revision = 'add_guardrails_layer_001'
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    op.add_column('agents', sa.Column('guardrail_prompt', sa.Text(), nullable=True))
+    op.add_column(
+        'agents',
+        sa.Column('guardrail_enabled', sa.Boolean(),
+                  server_default=sa.text('true'), nullable=False),
+    )
+
+
+def downgrade() -> None:
+    op.drop_column('agents', 'guardrail_enabled')
+    op.drop_column('agents', 'guardrail_prompt')