feat(mcp): support read config from database (MySQL, etc.)

[digitzh]

Describe what this PR does / why we need it

This PR read config of MCP services from a database(MySQL, etc.).

Used in the module spring-ai-alibaba-mcp-router currently.

Does this pull request fix one issue?

Describe how you did it

在配置类DbMcpProperties中配置数据库信息，通过类DbMcpServiceDiscovery从数据库获取MCP服务信息（SQL查询）。

Describe how to verify it

example仓库：spring-ai-alibaba-mcp-example/spring-ai-alibaba-mcp-config-example（示例程序已提交PR，可能尚未合并）给出了测试方法。简单来说，配置连接信息，在数据库中创建示例数据；运行测试程序、发送HTTP GET请求即可查询到服务信息。

Special notes for reviews

[GTyingzi]

另外记得，每一个文件都末尾记得留一个空白行

[Aias00]

hi. fix ci pls

[Copilot]

Pull Request Overview

This PR adds database support for MCP (Model Context Protocol) service configuration, allowing services to be read from databases like MySQL instead of being limited to file-based configuration.

• Introduces database-based service discovery via DbMcpServiceDiscovery with configurable SQL queries
• Adds file-based service discovery as an alternative to the existing Nacos-based approach
• Implements auto-configuration classes to support multiple discovery types (nacos, file, database)

Reviewed Changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
DbMcpServiceDiscovery.java	New service discovery implementation that queries database for MCP service configurations
FileConfigMcpServiceDiscovery.java	New file-based service discovery implementation for local configuration
DbMcpProperties.java	Configuration properties for database connection and query settings
McpRouterProperties.java	Enhanced to support multiple discovery types and service configurations
pom.xml	Added HikariCP dependency for database connection pooling
FileMcpRouterAutoConfiguration.java	Auto-configuration for file-based service discovery
DbMcpRouterAutoConfiguration.java	Auto-configuration for database-based service discovery
org.springframework.boot.autoconfigure.AutoConfiguration.imports	Registered new auto-configuration classes
DashScopeMultiModalChatTests.java	Updated comment to reference correct environment variable name

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