fix(spring-ai): order SpringAI auto-configuration after Spring AI mod…

[Lubaoshuai]

Closes #1501

Root cause

SpringAIAutoConfiguration guards its @Bean methods with @ConditionalOnBean(ChatModel/StreamingChatModel/EmbeddingModel), but declared no ordering relative to the Spring AI model auto-configurations that register those beans. @ConditionalOnBean is evaluated when the configuration is processed, and in a real application the auto-configurations are otherwise sorted alphabetically, which puts com.google.adk.models.springai.autoconfigure.SpringAIAutoConfiguration before org.springframework.ai.model.*.autoconfigure.*AutoConfiguration — every condition misses, and all SpringAI/SpringAIEmbedding beans are silently skipped (the springAIEmbedding failure being fully silent, as noted in the issue).

Since this module intentionally compiles only against spring-ai-model (no provider modules on the compile classpath), the class-based after attribute is not usable; the string-based afterName attribute exists exactly for this case, and unknown class names are ignored, so versions that lack a listed configuration are unaffected. This mirrors the approach Spring AI 1.x's own ChatClientAutoConfiguration used for the identical @ConditionalOnBean(ChatModel) situation.

The list covers the chat/embedding auto-configurations that exist in Spring AI 2.0.x, verified against each module's META-INF/spring/org.springframework.boot.autoconfigure.AutoConfiguration.imports at v2.0.1:

• chat: anthropic, bedrock converse, deepseek, google genai, mistralai, ollama, openai
• embedding: bedrock cohere/titan, google genai, mistralai, ollama, openai, postgresml, transformers, vertex ai

Testing

New SpringAIAutoConfigurationOrderingTest builds an ApplicationContextRunner with AutoConfigurations.of(SpringAIAutoConfiguration.class, OpenAiChatAutoConfiguration.class, OpenAiEmbeddingAutoConfiguration.class, ToolCallingAutoConfiguration.class). AutoConfigurations applies the same AutoConfigurationSorter as a real application, so:

• without the ordering declaration the test fails (the com.google.adk... configuration is processed before org.springframework.ai... and no SpringAI bean exists),
• with the ordering it passes and both SpringAI and SpringAIEmbedding beans are created.

spring-ai-autoconfigure-model-openai and spring-ai-autoconfigure-model-tool are added as test-scoped dependencies to make the real provider configurations available to the runner.

Module test run: 2/2 passing; the ordering test was also verified to fail when the afterName declaration is reverted (test-first verification).