Add SIM card management and emulator container service

- Add SimCardAssignmentService for managing SIM card assignments
- Add SimCardConfigurationView for UI-based SIM card configuration
- Add EmulatorContainerService for container lifecycle management
- Add NiederlassungResolver for branch/location resolution
- Add new POJOs: CourierInfo and SimCardInfo
- Refactor security: introduce SsoConfiguration and LoginSessionService
- Remove deprecated AdminView and VaadinAccessHandler
- Add unit tests for core services

pom.xml

@@ -75,6 +75,10 @@
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-security</artifactId>
         </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-oauth2-client</artifactId>
+        </dependency>
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-validation</artifactId>