feat: 修复 AI 风险语义并隔离 Mock 数据

server-go/migrations/000002_risk_assessment.down.sql

@@ -0,0 +1,6 @@
+DROP INDEX IF EXISTS idx_inspection_records_mock_created_at;
+
+ALTER TABLE inspection_records
+    DROP COLUMN IF EXISTS is_mock,
+    DROP COLUMN IF EXISTS model_version,
+    DROP COLUMN IF EXISTS risk_assessment;

server-go/migrations/000002_risk_assessment.up.sql

@@ -0,0 +1,7 @@
+ALTER TABLE inspection_records
+    ADD COLUMN IF NOT EXISTS risk_assessment jsonb,
+    ADD COLUMN IF NOT EXISTS model_version varchar(64),
+    ADD COLUMN IF NOT EXISTS is_mock boolean NOT NULL DEFAULT false;
+
+CREATE INDEX IF NOT EXISTS idx_inspection_records_mock_created_at
+    ON inspection_records (is_mock, created_at);