Merge asset statistics and contextual AI assistant into main

src/server/db/schema/asset-ai-gaps.ts

@@ -0,0 +1,15 @@
+import pool from "../mysql.js";
+import { ddlAllowed } from "./guard.js";
+
+const SCHEMA = `CREATE TABLE IF NOT EXISTS bi_asset_ai_gaps (
+ id BIGINT UNSIGNED AUTO_INCREMENT PRIMARY KEY,
+ user_id VARCHAR(64) NOT NULL, fingerprint CHAR(64) NOT NULL,
+ demand VARCHAR(600) NOT NULL, reason VARCHAR(24) NOT NULL, status VARCHAR(24) NOT NULL DEFAULT 'open',
+ occurrences INT NOT NULL DEFAULT 1, first_seen DATETIME NOT NULL, last_seen DATETIME NOT NULL,
+ UNIQUE KEY user_demand (user_id, fingerprint), KEY last_seen (last_seen)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4`;
+
+export async function ensureAssetAiGapTable() {
+  if (!ddlAllowed()) throw new Error("只读环境不创建需求记录表。");
+  await pool.query(SCHEMA);
+}