feat(license-minter): add cameleer-license-minter Maven module

Top-level module sibling to cameleer-server-core/-app. Depends on
cameleer-server-core for the LicenseInfo schema. Spring Boot
repackage produces a runnable -cli classifier for the vendor.

Not added as a dependency from cameleer-server-app — runtime tree
must not carry signing primitives.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

pom.xml

@@ -22,6 +22,7 @@
     <modules>
         <module>cameleer-server-core</module>
         <module>cameleer-server-app</module>
+        <module>cameleer-license-minter</module>
     </modules>
 
     <properties>