fix: cross-Boot-version autoconfiguration and CI-friendly version resolution

- OrdoJdbcAutoConfiguration: use string-based @AutoConfigureAfter(name = ...)
  to reference both Spring Boot 3.x and 4.x DataSource/Flyway autoconfiguration
  classes, since Boot 4 relocated these to dedicated modules.
- flatten-maven-plugin: switch flattenMode from resolveCiFriendliesOnly to
  defaults so inter-module dependency versions are fully resolved (not just
  the project's own <version>) when installed, fixing dependency resolution
  for external consumers.
- Align sibling-module dependency versions to use \ consistently.
- Ignore generated .flattened-pom.xml files.

ordo-spring-boot-starter/pom.xml

@@ -6,7 +6,7 @@
     <parent>
         <groupId>com.jetlumen</groupId>
         <artifactId>ordo</artifactId>
-        <version>1.0-SNAPSHOT</version>
+        <version>${revision}</version>
     </parent>
 
     <artifactId>ordo-spring-boot-starter</artifactId>
@@ -34,7 +34,7 @@
         <dependency>
             <groupId>com.jetlumen</groupId>
             <artifactId>ordo-spring-boot-autoconfigure</artifactId>
-            <version>${project.version}</version>
+            <version>${revision}</version>
         </dependency>
         <dependency>
             <groupId>org.springframework.boot</groupId>