工作台重命名：无界·无界 → 学会·无界

- ALL_TENANTS / session / seed / migrations 全部同步
- 新增 migrate_rename_tenant() 数据迁移，启动自动 UPDATE 所有表
- migrations/ 模式重构（参考 SalesManager）

backend/migrations/data_fixes.py

@@ -0,0 +1,49 @@
+"""migrations/data_fixes.py — 数据修正迁移（修复脏数据、变更枚举值）"""
+
+
+def migrate_fix_task_status():
+    """修正 project_tasks 中非法的 status 值"""
+    from flask_app import db, _exec, mysql, logger
+
+    conn = db()
+    try:
+        fixes = [
+            "UPDATE project_tasks SET status='未开始' WHERE status='' OR status IS NULL",
+            "UPDATE project_tasks SET status='已结束' WHERE status='done'",
+            "UPDATE project_tasks SET status='进行中' WHERE status='验收中'",
+        ]
+        for sql in fixes:
+            try:
+                cur = _exec(conn, sql)
+                affected = cur.rowcount
+                cur.close()
+                if affected:
+                    print(f"[migrate] 修正 {affected} 条任务状态")
+            except mysql.connector.Error as e:
+                logger.warning(f"task status fix skipped: {e}")
+        conn.commit()
+    finally:
+        conn.close()
+
+
+def migrate_rename_tenant():
+    """工作台重命名：无界·无界 → 学会·无界"""
+    from flask_app import db, _exec, mysql
+
+    conn = db()
+    try:
+        tables = ["user_tenants", "sales_leads", "follow_up_records", "business_proposals",
+                  "operation_projects", "product_versions", "finance_records", "project_tasks",
+                  "project_finances"]
+        for table in tables:
+            try:
+                cur = _exec(conn, f"UPDATE {table} SET tenant='学会·无界' WHERE tenant='无界·无界'")
+                affected = cur.rowcount
+                cur.close()
+                if affected:
+                    print(f"[migrate] {table}: {affected} 条记录 tenant 改为 '学会·无界'")
+            except mysql.connector.Error:
+                pass
+        conn.commit()
+    finally:
+        conn.close()