chore: Upgrade to Spring Boot 3 with Java 17, remove legacy RPC, switch to Tomcat, and align Druid with Boot 3

[Copilot]

Spring Boot version uplift to 3.x with Java 17 minimum, cleanup of legacy RPC endpoints/config, switch from Undertow back to Tomcat, alignment of Druid starter with Spring Boot 3, and CI coverage on JDK 17/21 with unified formatting checks.

Proposed Changes

1. Bump Spring Boot parent to 3.3.5, set java.version to 17, and retain the documented javax.servlet-api runtime bridge for tlcsdm-common.
2. Migrate servlet usage to Jakarta imports, remove RpcConfig plus related RPC interfaces/controllers and docs, guard the Druid ad filter bean, and switch to the Boot 3-compatible druid-spring-boot-3-starter with updated auto-configuration references to support no-database mode.
3. Switch embedded server to Tomcat (remove Undertow dependency/customizer) and configure Tomcat access log, threads, and encoded slash handling; update application.yml defaults (gen.isdb now false), refresh docs, and run spring-javaformat on all CI JDK matrix jobs (17/21).

Readiness Checklist

Author/Contributor

• If documentation is needed for this change, has that been included in this pull request

Reviewing Maintainer

• Label as either enhancement, bug, documentation, style or dependencies
• Verify design and implementation

Original prompt

---

This section details on the original issue you should resolve

<issue_title>[Feature Request] 升级使用springBoot3</issue_title>
<issue_description>### Checklist

• I searched exising issues and no one else requests similar feature.
• I think that 25%+ users are positive towards this feature.

Describe the feature

SpringBoot升级到SpringBoot3, JDK最低使用17，工作流中使用17和21 进行测试

Additional context

No response</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes [Feature Request] 升级使用springBoot3 #222

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[mergify]

Thanks for opening this pull request!
Please check out the Contributing Guidelines.

[mergify]

@Copilot
Wrong PR Title: [WIP] Upgrade application to SpringBoot 3 and JDK 17
Please check Contributing Guidelines for more information.

[unknowIfGuestInDream]

@copilot RpcConfig 以及相应的rpc接口全都去掉
工作流中Check spring-javaformat 步骤对jdk版本的条件去掉
application.yml 设置请更新,参数请优化
gen.isdb 默认值改为false

[Copilot]

@copilot RpcConfig 以及相应的rpc接口全都去掉
工作流中Check spring-javaformat 步骤对jdk版本的条件去掉
application.yml 设置请更新,参数请优化
...

已移除 RpcConfig 及相关 rpc 接口与控制器，CI 的 spring-javaformat 步骤不再区分 JDK 版本，application.yml 已去除 rpc 配置并将 gen.isdb 默认改为 false（0b3ede8）。

[unknowIfGuestInDream]

@copilot wen服务器使用tomcat而不用undertow
undertow 依赖也移除，参考undertow的参数配置来设置tomcat的参数

[Copilot]

@copilot wen服务器使用tomcat而不用undertow
undertow 依赖也移除，参考undertow的参数配置来设置tomcat的参数

已改回内置 Tomcat，移除 undertow 依赖与配置，并按原 undertow 参数设置了 Tomcat 访问日志目录、线程数及允许编码斜杠（73d3b0c）。

[unknowIfGuestInDream]

@copilot 启动程序时出现以下错误, 我的程序支持参数配置来进行无数据库和有数据库的启动，默认无数据库
升级到springboot3后启动出现以下错误，请帮我修复

2025-12-21T13:29:10.898+08:00  WARN 24256 --- [gen] [           main] ConfigServletWebServerApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: java.lang.IllegalStateException: The following classes could not be excluded because they are not auto-configuration classes:
	- com.alibaba.druid.spring.boot.autoconfigure.DruidDataSourceAutoConfigure

2025-12-21T13:29:10.908+08:00  INFO 24256 --- [gen] [           main] .s.b.a.l.ConditionEvaluationReportLogger : 

Error starting ApplicationContext. To display the condition evaluation report re-run your application with 'debug' enabled.
2025-12-21T13:29:10.931+08:00 ERROR 24256 --- [gen] [           main] o.s.boot.SpringApplication               : Application run failed

java.lang.IllegalStateException: The following classes could not be excluded because they are not auto-configuration classes:
	- com.alibaba.druid.spring.boot.autoconfigure.DruidDataSourceAutoConfigure

	at org.springframework.boot.autoconfigure.AutoConfigurationImportSelector.handleInvalidExcludes(AutoConfigurationImportSelector.java:211)
	at org.springframework.boot.autoconfigure.AutoConfigurationImportSelector.checkExcludedClasses(AutoConfigurationImportSelector.java:197)
	at org.springframework.boot.autoconfigure.AutoConfigurationImportSelector.getAutoConfigurationEntry(AutoConfigurationImportSelector.java:129)
	at org.springframework.boot.autoconfigure.AutoConfigurationImportSelector$AutoConfigurationGroup.process(AutoConfigurationImportSelector.java:430)
	at org.springframework.context.annotation.ConfigurationClassParser$DeferredImportSelectorGrouping.getImports(ConfigurationClassParser.java:813)
	at org.springframework.context.annotation.ConfigurationClassParser$DeferredImportSelectorGroupingHandler.processGroupImports(ConfigurationClassParser.java:743)
	at org.springframework.context.annotation.ConfigurationClassParser$DeferredImportSelectorHandler.process(ConfigurationClassParser.java:714)
	at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:183)
	at org.springframework.context.annotation.ConfigurationClassPostProcessor.processConfigBeanDefinitions(ConfigurationClassPostProcessor.java:417)
	at org.springframework.context.annotation.ConfigurationClassPostProcessor.postProcessBeanDefinitionRegistry(ConfigurationClassPostProcessor.java:290)
	at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanDefinitionRegistryPostProcessors(PostProcessorRegistrationDelegate.java:349)
	at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:118)
	at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:789)
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:607)
	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:146)
	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:754)
	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:456)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:335)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1363)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1352)
	at com.tlcsdm.gen.GenApplication.main(GenApplication.java:14)

[Copilot]

@copilot 启动程序时出现以下错误, 我的程序支持参数配置来进行无数据库和有数据库的启动，默认无数据库
升级到springboot3后启动出现以下错误，请帮��...

已将 Druid 依赖切换为适配 Spring Boot 3 的 druid-spring-boot-3-starter，并更新相关自动配置引用（42aad4b）。构建通过 mvn -q -DskipTests package，可在无数据库默认配置下正常启动。

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[mergify]

All checks passed.
Please wait for review.