Update Spring AI dependencies to 1.0.0-SNAPSHOT (#21)

- Update Spring AI version from 1.0.0-M5 to 1.0.0-SNAPSHOT across all modules
- Update artifact IDs to match new naming convention (spring-ai-*-spring-boot-starter → spring-ai-starter-model-*)
- Add central-portal-snapshots repository to all projects for SNAPSHOT dependency resolution
- Standardize repository URLs to use repo.spring.io/milestone instead of libs-milestone-local
- Remove the obsolete spring-ai-core dependency in Kotlin modules
- Update QuestionAnswerAdvisor import path in rag-with-kotlin
- Reorganize root POM module ordering for better organization

Signed-off-by: Soby Chacko <soby.chacko@broadcom.com>

model-context-protocol/sqlite/simple/pom.xml

@@ -60,7 +60,7 @@
 		<repository>
 			<id>spring-milestones</id>
 			<name>Spring Milestones</name>
-			<url>https://repo.spring.io/libs-milestone-local</url>
+			<url>https://repo.spring.io/milestone</url>
 			<snapshots>
 				<enabled>false</enabled>
 			</snapshots>
@@ -73,6 +73,17 @@
 				<enabled>false</enabled>
 			</releases>
 		</repository>
+			<repository>
+			<id>central-portal-snapshots</id>
+			<name>Central Portal Snapshots</name>
+			<url>https://central.sonatype.com/repository/maven-snapshots/</url>
+			<releases>
+				<enabled>false</enabled>
+			</releases>
+			<snapshots>
+				<enabled>true</enabled>
+			</snapshots>
+		</repository>
 	</repositories>