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_crm_customer_syncs_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 crm_customer_syncs (per-person CRM link)
+
+Revision ID: add_crm_customer_syncs_001
+Revises: a8efc6b31aa8
+Create Date: 2026-07-28 20:40:00.000000
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+from sqlalchemy.dialects import postgresql
+
+
+# revision identifiers, used by Alembic.
+revision: str = 'add_crm_customer_syncs_001'
+down_revision: Union[str, None] = 'a8efc6b31aa8'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    op.create_table(
+        'crm_customer_syncs',
+        sa.Column('id', postgresql.UUID(as_uuid=True), nullable=False),
+        sa.Column('organization_id', postgresql.UUID(as_uuid=True), nullable=False),
+        sa.Column('customer_id', postgresql.UUID(as_uuid=True), nullable=False),
+        sa.Column('provider', sa.String(length=32), nullable=False),
+        sa.Column('contact_id', sa.String(), nullable=True),
+        sa.Column('secondary_id', sa.String(), nullable=True),
+        sa.Column('record_url', sa.String(), nullable=True),
+        sa.Column('synced_at', sa.DateTime(timezone=True), server_default=sa.text('now()'), nullable=True),
+        sa.ForeignKeyConstraint(['organization_id'], ['organizations.id'], ondelete='CASCADE'),
+        sa.ForeignKeyConstraint(['customer_id'], ['customers.id'], ondelete='CASCADE'),
+        sa.PrimaryKeyConstraint('id'),
+        sa.UniqueConstraint('customer_id', 'provider', name='uq_crm_customer_sync_customer_provider'),
+    )
+    op.create_index('ix_crm_customer_syncs_organization_id', 'crm_customer_syncs', ['organization_id'])
+    op.create_index('ix_crm_customer_syncs_customer_id', 'crm_customer_syncs', ['customer_id'])
+
+
+def downgrade() -> None:
+    op.drop_index('ix_crm_customer_syncs_customer_id', table_name='crm_customer_syncs')
+    op.drop_index('ix_crm_customer_syncs_organization_id', table_name='crm_customer_syncs')
+    op.drop_table('crm_customer_syncs')