Initial commit: SAP C4C attachment downloader toolkit

- Add Python script for downloading C4C attachments via OData and web scraping
- Add Java wrapper for programmatic access with typed API
- Add DSM upload utility for Synology NAS integration
- Add CLAUDE.md documentation for future development
- Add .gitignore for Python, Java, and sensitive files

.claude/settings.local.json

@@ -0,0 +1,8 @@
+{
+  "permissions": {
+    "allow": [
+      "Bash(git init:*)",
+      "Bash(git add:*)"
+    ]
+  }
+}