refactor: Migrate from monolithic to modular architecture

1. **Docker-Compose für Entwicklung optimieren**
2. **Umgebungsvariablen für lokale Entwicklung**
3. **Service-Abhängigkeiten**
4. **Docker-Compose für Produktion**
5. **Dokumentation**

settings.gradle.kts

@@ -25,10 +25,6 @@ dependencyResolutionManagement {
                 includeGroupAndSubgroups("com.google")
             }
         }
-        // Add a JCenter repository (archive)
-        maven {
-            url = uri("https://jcenter.bintray.com")
-        }
         // Add JitPack repository
         maven {
             url = uri("https://jitpack.io")
@@ -37,10 +33,6 @@ dependencyResolutionManagement {
         maven {
             url = uri("https://oss.sonatype.org/content/repositories/snapshots/")
         }
-        // Add Maven repository for Ecwid libraries
-        maven {
-            url = uri("https://dl.bintray.com/ecwid/maven")
-        }
     }
 }