Fix Document API field names to match Go backend

- Change residence to residence_id with @SerialName annotation
- Change contractor to contractor_id with @SerialName annotation
- Update DocumentApi.kt to use correct field names in form data and JSON requests
- Fixes iOS document creation failing with "missing residence_id" error

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

iosApp/iosApp/Assets.xcassets/AppIcon.appiconset/Contents.json

@@ -1,7 +1,7 @@
 {
   "images" : [
     {
-      "filename" : "logo_primary.png",
+      "filename" : "mycrib-icon@2x.png",
       "idiom" : "universal",
       "platform" : "ios",
       "size" : "1024x1024"