MRBS 1.12.2 等保2.0二级整改完整提交

包含：登录失败锁定、90天密码有效期、30分钟会话超时、
强制改密、登录审计日志、屏幕水印、企业背景图、
备案信息固定底部、favicon、JS空集合保护、
会话过期体验优化（403 JSON）、display_errors 关闭、
固定 key 根治 Integrity check failed 等全部改动

注意：config.inc.php/.htaccess/.user.ini 含敏感信息，
通过 .gitignore 排除，勿推送到公开仓库。

upgrade/41/mysql.sql

@@ -0,0 +1,41 @@
+# Make mrbs_entry.repeat_id a foreign key
+
+# Previously repeat_id was set to zero if there was no repeat.
+# However this breaks our foreign key constraint so we have to modify
+# the repeat_id column before we can create the foreign key.
+
+/* Temporary copy of timestamp column */
+ALTER TABLE %DB_TBL_PREFIX%entry
+  ADD COLUMN saved_ts DATETIME;
+UPDATE %DB_TBL_PREFIX%entry SET saved_ts=timestamp;
+
+ALTER TABLE %DB_TBL_PREFIX%entry
+  MODIFY COLUMN repeat_id int DEFAULT NULL;
+  
+UPDATE %DB_TBL_PREFIX%entry
+  SET repeat_id=NULL WHERE repeat_id=0;
+
+# Tidy up the database getting rid of any zombie rows which would prevent
+# the foreign key being created.   Note that these rows will not be visible to users 
+# and admins through MRBS.   They have most likely been created when a row has been
+# deleted from a table using a database admin tool, rather than through MRBS.  Of course,
+# foreign keys will stop this happening in the future.
+
+DELETE FROM %DB_TBL_PREFIX%entry
+  WHERE repeat_id IS NOT NULL
+  AND repeat_id NOT IN (SELECT id FROM %DB_TBL_PREFIX%repeat);
+  
+DELETE FROM %DB_TBL_PREFIX%repeat
+  WHERE id NOT IN (SELECT repeat_id FROM %DB_TBL_PREFIX%entry WHERE repeat_id IS NOT NULL);
+
+
+ALTER TABLE %DB_TBL_PREFIX%entry
+  ADD FOREIGN KEY (repeat_id) 
+    REFERENCES %DB_TBL_PREFIX%repeat(id)
+    ON UPDATE CASCADE
+    ON DELETE CASCADE;
+
+/* Put the table back to how it was */
+UPDATE %DB_TBL_PREFIX%entry SET timestamp=saved_ts;
+ALTER TABLE %DB_TBL_PREFIX%entry
+  DROP COLUMN saved_ts;