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_investigation_runs_001_add_runs.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 investigation_runs (AI triage/investigation queue)
+
+Revision ID: add_investigation_runs_001
+Revises: add_ticketing_core_001
+Create Date: 2026-07-16
+
+Phase 2 of AI-first ticketing: the run table doubles as the worker queue
+(ticket_investigator polls status='pending', mirroring faq_generation_jobs).
+Budgets and token actuals live on the row for cost tracking.
+"""
+from alembic import op
+import sqlalchemy as sa
+from sqlalchemy.dialects import postgresql
+
+# revision identifiers, used by Alembic.
+revision = 'add_investigation_runs_001'
+down_revision = 'add_ticketing_core_001'
+branch_labels = None
+depends_on = None
+
+ACTIVE_RUN_STATUSES = ('pending', 'running')
+
+
+def upgrade() -> None:
+    op.create_table(
+        'investigation_runs',
+        sa.Column('id', postgresql.UUID(as_uuid=True), nullable=False),
+        sa.Column('ticket_id', postgresql.UUID(as_uuid=True), nullable=False),
+        sa.Column('organization_id', postgresql.UUID(as_uuid=True), nullable=False),
+        sa.Column('run_type', sa.String(), nullable=False),
+        sa.Column('status', sa.String(), nullable=False),
+        sa.Column('trigger', sa.String(), nullable=False),
+        sa.Column('requested_by_user_id', postgresql.UUID(as_uuid=True), nullable=True),
+        sa.Column('context_note', sa.Text(), nullable=True),
+        sa.Column('max_tool_calls', sa.Integer(), server_default='25', nullable=False),
+        sa.Column('max_wall_seconds', sa.Integer(), server_default='600', nullable=False),
+        sa.Column('tool_calls_used', sa.Integer(), server_default='0', nullable=False),
+        sa.Column('llm_calls', sa.Integer(), server_default='0', nullable=False),
+        sa.Column('input_tokens', sa.BigInteger(), server_default='0', nullable=False),
+        sa.Column('output_tokens', sa.BigInteger(), server_default='0', nullable=False),
+        sa.Column('model_name', sa.String(), nullable=True),
+        sa.Column('error', sa.Text(), nullable=True),
+        sa.Column('started_at', sa.DateTime(timezone=True), nullable=True),
+        sa.Column('finished_at', sa.DateTime(timezone=True), nullable=True),
+        sa.Column('created_at', sa.DateTime(timezone=True), server_default=sa.text('now()'), nullable=True),
+        sa.Column('updated_at', sa.DateTime(timezone=True), nullable=True),
+        sa.ForeignKeyConstraint(['ticket_id'], ['tickets.id'], ondelete='CASCADE'),
+        sa.ForeignKeyConstraint(['organization_id'], ['organizations.id'], ondelete='CASCADE'),
+        sa.ForeignKeyConstraint(['requested_by_user_id'], ['users.id'], ondelete='SET NULL'),
+        sa.PrimaryKeyConstraint('id'),
+    )
+    op.create_index(op.f('ix_investigation_runs_ticket_id'), 'investigation_runs', ['ticket_id'])
+    op.create_index(op.f('ix_investigation_runs_organization_id'), 'investigation_runs', ['organization_id'])
+    # Keeps the worker's poll O(active rows) as terminal rows accumulate.
+    op.create_index(
+        'ix_investigation_runs_active',
+        'investigation_runs',
+        ['status'],
+        postgresql_where=sa.text(
+            "status IN ({})".format(", ".join(f"'{s}'" for s in ACTIVE_RUN_STATUSES))
+        ),
+    )
+    # Closes the enqueue check-then-insert race: at most one active run per
+    # ticket. Lives only in the migration (sqlite tests can't compile the
+    # partial WHERE).
+    op.execute(
+        "CREATE UNIQUE INDEX uq_investigation_runs_one_active ON investigation_runs "
+        "(ticket_id) WHERE status IN ('pending', 'running')"
+    )
+
+
+def downgrade() -> None:
+    op.execute("DROP INDEX IF EXISTS uq_investigation_runs_one_active")
+    op.drop_index('ix_investigation_runs_active', table_name='investigation_runs')
+    op.drop_index(op.f('ix_investigation_runs_organization_id'), table_name='investigation_runs')
+    op.drop_index(op.f('ix_investigation_runs_ticket_id'), table_name='investigation_runs')
+    op.drop_table('investigation_runs')