chore: update assets & res srcDirs to match RN paths

[krozniata]

Summary

Updates assets and res srcDirs in RNSourceSets.kt file to match RN core and to ensure that bundle is correctly included in .aar

Test plan

1. Build framework using updated plugin
2. Check if bundle is present in .aar inside assets/ directory (rename .aar to .zip and extract contents)

---

Note

Include both legacy and new RN bundle asset/res paths in Gradle source sets; add troubleshooting docs and README link.

• Gradle plugin (Android):
  • Update RNSourceSets.configureSourceSets to include RN bundle outputs for both RN <= 0.81 and RN >= 0.82 by sourcing assets and res from build/generated/{assets,res}/createBundleReleaseJsAndAssets and build/generated/{assets,res}/react/release.
• Docs:
  • Add docs/TROUBLESHOOTING.md with guidance for Android duplicate resources after RN 0.82 and iOS "No script URL provided".
  • Update README.md with a new Troubleshooting section linking to the doc.

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