Add Basic Authentication documentation and enhance InfluxDB migration auth guide

[KanavCode]

Changes Made

New Documentation

• Basic Authentication Page (operations/basic-auth.md)
  • Complete configuration guide with server.conf examples
  • Client integration examples for all supported languages

Enhanced Documentation

• InfluxDB Migration Guide (guides/influxdb-migration.md)
  • New authentication migration section
  • Configuration matrix comparing InfluxDB vs QuestDB auth
  • Step-by-step migration process with code examples
  • Security considerations for production environments

[CLAassistant]

All committers have signed the CLA.

[KanavCode]

Hi, @javier, Please Check and Merge My Commit.

[javier]

Thanks, @KanavCode . I would need the contributor agreement signed. Otherwise the automation doesn't allow me to preview and approve

[KanavCode]

Thanks, @KanavCode . I would need the contributor agreement signed. Otherwise the automation doesn't allow me to preview and approve

Yeah, Please Do.

[javier]

Thanks, @KanavCode . I would need the contributor agreement signed. Otherwise the automation doesn't allow me to preview and approve

Yeah, Please Do.

Did you sign the CLA? The CLAAssistant comment above failed to verify it

[KanavCode]

Thanks, @KanavCode . I would need the contributor agreement signed. Otherwise the automation doesn't allow me to preview and approve

Yeah, Please Do.

Did you sign the CLA? The CLAAssistant comment above failed to verify it

Yupp, Done 👍