i18n: per-player EN/PT via Adventure GlobalTranslator (#1)

Foundation + commands module of the i18n spec.

- I18n registry/loader + Lang.tr facade + reloadI18n
- PT source-of-truth bundle + EN translation
- CanalhandiaCommand player-facing strings migrated; admin-tuning/help/enum-labels deferred
- I18nTest: parity + per-locale render + pt_BR fallback; 316/316 green

🤖 Generated with [Claude Code](https://claude.com/claude-code)

pom.xml

@@ -20,6 +20,10 @@
       <id>papermc</id>
       <url>https://repo.papermc.io/repository/maven-public/</url>
     </repository>
+    <repository>
+      <id>bluecolored</id>
+      <url>https://repo.bluecolored.de/releases</url>
+    </repository>
   </repositories>
 
   <dependencyManagement>
@@ -44,6 +48,17 @@
       <version>26.2.build.92-stable</version>
       <scope>provided</scope>
     </dependency>
+    <!-- BlueMap's API, for putting public notes on the web map. "provided"
+         because BlueMap ships these classes itself: the plugin compiles
+         against them but never bundles them, and BlueMapBridge is the only
+         class that touches them, so the plugin still loads on a server that
+         has no BlueMap at all. -->
+    <dependency>
+      <groupId>de.bluecolored</groupId>
+      <artifactId>bluemap-api</artifactId>
+      <version>2.7.4</version>
+      <scope>provided</scope>
+    </dependency>
     <dependency>
       <groupId>org.junit.jupiter</groupId>
       <artifactId>junit-jupiter</artifactId>