[ENHANCEMENT] Update dependencies and improve docs

[ibakshay]

Changes

• Upgraded to Go 1.23
• Updated all project dependencies
• Enhanced README
• Refreshed config/samples manifests
• Updated CRDs in config/crd/bases to reflect new schema
• Added optional perses-server-url flag for localhost testing:

  flag.StringVar(&persesServerURL, "perses-server-url", "", "The Perses backend server URL")

fixes #16 https://github.com/cloudoperators/greenhouse-extensions/issues/419

[jgbernalp]

@ibakshay thank you for your contribution!. Can you please take a look at the tests, they might need an update.

[ibakshay]

@ibakshay thank you for your contribution!. Can you please take a look at the tests, they might need an update.

My pleasure. Thanks a lot for your review. The test is failing due to this serialization issue. I have already created a PR in prometheus/common repository for the fix. The test should be successfully after PR in prometheus/common gets merged.