Replace JNA with the FFM API (Panama) for the Opus binding

Bind libopus through java.lang.foreign downcall handles instead of JNA:
the ctl functions are linked with firstVariadicArg(2), and the encoder and
decoder each own a shared Arena holding the handle plus reusable native
PCM/packet buffers, so the hot path only allocates the returned packet.

The library is resolved by system SONAME first, falling back to a bundled
copy extracted from the JAR. Only the Windows x86-64 build is packaged by
default now (-Dnatives.all restores all platforms), since every other
platform ships libopus through its package manager.

Requires Java 26.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

ts3-client/pom.xml

@@ -19,10 +19,9 @@
     </modules>
 
     <properties>
-        <maven.compiler.release>17</maven.compiler.release>
+        <maven.compiler.release>26</maven.compiler.release>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <ts3j.version>1.0.3</ts3j.version>
-        <jna.version>5.14.0</jna.version>
     </properties>
 
     <dependencyManagement>
@@ -32,11 +31,6 @@
                 <artifactId>ts3j</artifactId>
                 <version>${ts3j.version}</version>
             </dependency>
-            <dependency>
-                <groupId>net.java.dev.jna</groupId>
-                <artifactId>jna</artifactId>
-                <version>${jna.version}</version>
-            </dependency>
             <dependency>
                 <groupId>com.ts3client</groupId>
                 <artifactId>ts3-client-core</artifactId>