feat(common): 添加 MybatisPlusConfig/StateValidator，修复 jsqlparser 依赖 (T010/T011)

- MybatisPlusConfig: TenantLineInnerInterceptor + PaginationInnerInterceptor
- StateValidator: 通用状态机校验，失败抛出 INVALID_STATE_TRANSITION
- pom.xml: 新增 mybatis-plus-jsqlparser 3.5.9（3.5.7+ 必须显式引入）

src/main/java/com/label/common/config/MybatisPlusConfig.java

@@ -0,0 +1,57 @@
+package com.label.common.config;
+
+import com.baomidou.mybatisplus.extension.plugins.MybatisPlusInterceptor;
+import com.baomidou.mybatisplus.extension.plugins.handler.TenantLineHandler;
+import com.baomidou.mybatisplus.extension.plugins.inner.PaginationInnerInterceptor;
+import com.baomidou.mybatisplus.extension.plugins.inner.TenantLineInnerInterceptor;
+import com.label.common.context.CompanyContext;
+import net.sf.jsqlparser.expression.Expression;
+import net.sf.jsqlparser.expression.LongValue;
+import net.sf.jsqlparser.expression.NullValue;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+import java.util.Arrays;
+import java.util.List;
+
+@Configuration
+public class MybatisPlusConfig {
+
+    // Tables that do NOT need tenant isolation (either global or tenant root tables)
+    private static final List<String> IGNORED_TABLES = Arrays.asList(
+        "sys_company",  // the tenant root table itself
+        "sys_config"    // has company_id=NULL for global defaults; service handles this manually
+    );
+
+    @Bean
+    public MybatisPlusInterceptor mybatisPlusInterceptor() {
+        MybatisPlusInterceptor interceptor = new MybatisPlusInterceptor();
+
+        // 1. Tenant isolation - auto-injects WHERE company_id = ?
+        interceptor.addInnerInterceptor(new TenantLineInnerInterceptor(new TenantLineHandler() {
+            @Override
+            public Expression getTenantId() {
+                Long companyId = CompanyContext.get();
+                if (companyId == null) {
+                    return new NullValue();
+                }
+                return new LongValue(companyId);
+            }
+
+            @Override
+            public String getTenantIdColumn() {
+                return "company_id";
+            }
+
+            @Override
+            public boolean ignoreTable(String tableName) {
+                return IGNORED_TABLES.contains(tableName);
+            }
+        }));
+
+        // 2. Pagination interceptor (required for MyBatis Plus Page queries)
+        interceptor.addInnerInterceptor(new PaginationInnerInterceptor());
+
+        return interceptor;
+    }
+}