test(04-01): add failing tests for security services

- JwtService: 7 tests for access/refresh token creation and validation
- Ed25519SigningService: 5 tests for keypair, signing, verification
- BootstrapTokenValidator: 6 tests for token matching and rotation
- Core interfaces and stub implementations (all throw UnsupportedOperationException)
- Added nimbus-jose-jwt and spring-boot-starter-security dependencies

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

cameleer3-server-app/pom.xml

@@ -66,11 +66,25 @@
             <artifactId>org.eclipse.xtext.xbase.lib</artifactId>
             <version>2.37.0</version>
         </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-security</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>com.nimbusds</groupId>
+            <artifactId>nimbus-jose-jwt</artifactId>
+            <version>9.47</version>
+        </dependency>
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-test</artifactId>
             <scope>test</scope>
         </dependency>
+        <dependency>
+            <groupId>org.springframework.security</groupId>
+            <artifactId>spring-security-test</artifactId>
+            <scope>test</scope>
+        </dependency>
         <dependency>
             <groupId>org.testcontainers</groupId>
             <artifactId>testcontainers-clickhouse</artifactId>