Migration Client hinzugefügt

Migration-Client.md

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+# Migration Client
+
+The migration client is the source-side helper for guided migrations from existing Romexis installations.
+
+Current direction:
+
+```text
+Windows client first
+Future: evaluate C# for broader platform support
+```
+
+---
+
+## Responsibilities
+
+The client should help with:
+
+- detecting local Romexis installation paths
+- detecting SQL Server connection settings
+- creating a database backup
+- detecting Romexis image and ergo data directories
+- creating a migration job through the migration service API
+- uploading data through rclone/SFTP
+- calling API endpoints to advance workflow state
+- displaying progress and logs
+
+---
+
+## Why rclone?
+
+rclone is suitable for large migrations because it supports:
+
+- SFTP
+- progress output
+- retries
+- resumable workflows
+- directory synchronization
+- configurable transfers/checkers
+
+---
+
+## Python vs C# Direction
+
+The initial client is Python-based because it is fast to develop and easy to integrate with existing scripts.
+
+For future macOS support, C# may become the better long-term option because it can provide:
+
+- native Windows build
+- possible macOS build
+- stronger GUI options
+- easier single-binary packaging
+- better long-term maintainability for a desktop migration client
+
+The README should keep this as an architectural direction, not as a completed feature.