新增系统配置表及默认配置，更新链接生成请求DTO以支持链接数量参数，重构链接生成服务逻辑，添加链接状态查询和有效性检查接口，优化日志记录。

target/classes/mapper/agent/LinkBatchMapper.xml

@@ -6,26 +6,24 @@
         <result property="agentId" column="agent_id" />
         <result property="quantity" column="quantity" />
         <result property="times" column="times" />
-        <result property="batchSize" column="batch_size" />
-        <result property="deductPoints" column="deduct_points" />
         <result property="operatorId" column="operator_id" />
         <result property="createdAt" column="created_at" />
     </resultMap>
 
     <select id="findById" parameterType="long" resultMap="LinkBatchMap">
-        SELECT id, agent_id, quantity, times, batch_size, deduct_points, operator_id, created_at
+        SELECT id, agent_id, quantity, times, operator_id, created_at
         FROM link_batch
         WHERE id = #{id}
         LIMIT 1
     </select>
 
     <insert id="insert" parameterType="com.gameplatform.server.model.entity.agent.LinkBatch" useGeneratedKeys="true" keyProperty="id">
-        INSERT INTO link_batch (agent_id, quantity, times, batch_size, deduct_points, operator_id)
-        VALUES (#{agentId}, #{quantity}, #{times}, #{batchSize}, #{deductPoints}, #{operatorId})
+        INSERT INTO link_batch (agent_id, quantity, times, operator_id)
+        VALUES (#{agentId}, #{quantity}, #{times}, #{operatorId})
     </insert>
 
     <select id="findByAgentId" resultMap="LinkBatchMap">
-        SELECT id, agent_id, quantity, times, batch_size, deduct_points, operator_id, created_at
+        SELECT id, agent_id, quantity, times, operator_id, created_at
         FROM link_batch
         WHERE agent_id = #{agentId}
         ORDER BY created_at DESC
@@ -37,7 +35,7 @@
     </select>
 
     <select id="findAll" resultMap="LinkBatchMap">
-        SELECT id, agent_id, quantity, times, batch_size, deduct_points, operator_id, created_at
+        SELECT id, agent_id, quantity, times, operator_id, created_at
         FROM link_batch
         ORDER BY created_at DESC
         LIMIT #{size} OFFSET #{offset}