Also switches pom.xml to spring-boot-starter-session-jdbc (Spring Boot 4.x
split the session auto-config into a separate starter; spring-session-jdbc
alone does not register JdbcSessionAutoConfiguration).
Adds SpringSessionConfig#cookieSerializer bean to configure fa_session name
and SameSite=Strict (spring.session.cookie.* properties are no longer
supported by the Boot 4.x auto-configuration layer).
Cleans up application.yaml / application-dev.yaml: removes store-type: jdbc
and the unsupported cookie.* keys.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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