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/0cf5fa1db0cb_add_teamid_to_agent_sessions.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.
+"""
+
+"""add_teamid_to_agent_sessions
+
+Revision ID: 0cf5fa1db0cb
+Revises: 91a148726029
+Create Date: 2025-03-21 13:57:55.161703
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision: str = '0cf5fa1db0cb'
+down_revision: Union[str, None] = '91a148726029'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+def upgrade() -> None:
+    # Check if 'ai' schema and agent_sessions table exist before attempting to modify
+    conn = op.get_bind()
+    
+    # Check if schema exists
+    schema_result = conn.execute(sa.text("SELECT schema_name FROM information_schema.schemata WHERE schema_name = 'ai'"))
+    schema_exists = schema_result.fetchone() is not None
+    
+    if not schema_exists:
+        print("Schema 'ai' does not exist, skipping migration")
+        return
+    
+    # Check if table exists
+    table_result = conn.execute(sa.text(
+        "SELECT table_name FROM information_schema.tables WHERE table_schema = 'ai' AND table_name = 'agent_sessions'"
+    ))
+    table_exists = table_result.fetchone() is not None
+    
+    if table_exists:
+        # Add team_id column to ai.agent_sessions table
+        op.add_column('agent_sessions', 
+            sa.Column('team_id', sa.UUID(), nullable=True),
+            schema='ai'
+        )
+    else:
+        print("Table 'ai.agent_sessions' does not exist, skipping migration")
+
+
+def downgrade() -> None:
+    # Check if 'ai' schema and agent_sessions table exist before attempting to modify
+    conn = op.get_bind()
+    
+    # Check if schema exists
+    schema_result = conn.execute(sa.text("SELECT schema_name FROM information_schema.schemata WHERE schema_name = 'ai'"))
+    schema_exists = schema_result.fetchone() is not None
+    
+    if not schema_exists:
+        print("Schema 'ai' does not exist, skipping migration rollback")
+        return
+    
+    # Check if table exists
+    table_result = conn.execute(sa.text(
+        "SELECT table_name FROM information_schema.tables WHERE table_schema = 'ai' AND table_name = 'agent_sessions'"
+    ))
+    table_exists = table_result.fetchone() is not None
+    
+    if table_exists:
+        # Drop team_id column from ai.agent_sessions table
+        op.drop_column('agent_sessions', 'team_id', schema='ai')
+    else:
+        print("Table 'ai.agent_sessions' does not exist, skipping migration rollback")