feat: build Docker entrypoint per runtime type with custom args support

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

cameleer3-server-core/src/main/java/com/cameleer3/server/core/runtime/AppService.java

@@ -32,6 +32,11 @@ public class AppService {
     public App getBySlug(String slug) { return appRepo.findBySlug(slug).orElseThrow(() -> new IllegalArgumentException("App not found: " + slug)); }
     public List<AppVersion> listVersions(UUID appId) { return versionRepo.findByAppId(appId); }
 
+    public AppVersion getVersion(UUID versionId) {
+        return versionRepo.findById(versionId)
+                .orElseThrow(() -> new IllegalArgumentException("AppVersion not found: " + versionId));
+    }
+
     public void updateContainerConfig(UUID id, Map<String, Object> containerConfig) {
         getById(id); // verify exists
         appRepo.updateContainerConfig(id, containerConfig);

cameleer3-server-core/src/main/java/com/cameleer3/server/core/runtime/ContainerRequest.java

@@ -20,5 +20,8 @@ public record ContainerRequest(
         List<Integer> exposedPorts,
         int healthCheckPort,
         String restartPolicyName,
-        int restartPolicyMaxRetries
+        int restartPolicyMaxRetries,
+        String runtimeType,
+        String customArgs,
+        String mainClass
 ) {}