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/merge_tkt_phone_001.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.
+"""
+
+"""merge native-ticketing and customer-phone migration heads
+
+Revision ID: merge_tkt_phone_001
+Revises: add_investigation_runs_001, add_customer_phone_001
+Create Date: 2026-07-17
+
+The ticketing feature branched from add_hc_faq_feedback_001 at the same time
+main's WhatsApp phone-identity work did, leaving two alembic heads. This
+no-op merge rejoins them so `alembic upgrade head` (used by the deploy) has a
+single target. The revision id is kept short — alembic_version.version_num is
+varchar(32).
+"""
+from alembic import op  # noqa: F401
+import sqlalchemy as sa  # noqa: F401
+
+# revision identifiers, used by Alembic.
+revision = 'merge_tkt_phone_001'
+down_revision = ('add_investigation_runs_001', 'add_customer_phone_001')
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    pass
+
+
+def downgrade() -> None:
+    pass