refactor: rename Java packages com.cameleer.{server,license} → io.cameleer

Brand-aligned reverse-DNS: io.cameleer matches the owned cameleer.io
domain. Part of institutionalization prep — clean break, no compat shims.

Scope:
- 613 .java files: package + import declarations and directory layout
- 5 POMs: groupId for cameleer-server-parent and 4 modules; mainClass FQN
  in cameleer-license-minter; internal inter-module dep coordinates
- .claude/rules/{core,app}-classes.md + CLAUDE.md: keep class/API maps in
  sync per the maintenance rule in CLAUDE.md

Out of scope (intentionally preserved on com.cameleer):
- com.cameleer:cameleer-common — external dep from the agent repo
- Spring config namespaces (cameleer.server.*) — they're property keys,
  not Java packages

Consumer heads-up:
- cameleer-saas pulls io.cameleer:cameleer-license-{api,minter} on next
  sync; their POMs need the matching groupId bump.

Verification: mvn install -DskipITs (273 server-app unit tests pass under
io.cameleer.* package names; license-api / server-core / license-minter
modules all green). The repackage step's JAR-rename failure during the run
was a file lock from a co-running dev server, unrelated to the rename.

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

cameleer-license-api/pom.xml

@@ -5,7 +5,7 @@
     <modelVersion>4.0.0</modelVersion>
 
     <parent>
-        <groupId>com.cameleer</groupId>
+        <groupId>io.cameleer</groupId>
         <artifactId>cameleer-server-parent</artifactId>
         <version>1.0-SNAPSHOT</version>
     </parent>