refactor(config): remove unused config files

[halibobo1205]

Summary

• Removed 4 unused config files from framework/src/main/resources/:
  • config-backup.conf — old backup with no references in the codebase
  • config-beta.conf — no references in the codebase
  • config-test-net.conf — no references in the codebase
  • config-localtest.conf — only used in tests; src/test/resources/config-localtest.conf takes precedence on the test classpath, making this copy dead code

Test plan

• Verify existing tests still pass (they load config-localtest.conf from src/test/resources)
• Verify no runtime references to removed files

[halibobo1205]

Maybe should adding a CONFIG_MIGRATION.md to indicate that the these deleted files have been moved to https://github.com/tronprotocol/tron-deployment?

I think this will help users find the correct configs after this cleanup.

I don't see the need for this. These configurations were originally set up for unit tests — they serve no purpose in the production environment and are not being utilized in the current test environment either.

[vividctrlalt]

Great cleanup! These files should have been removed a long time ago.