Pooldose Docs: add number platform

[lmaertin]

Proposed change

Add docs for number platform:

• pH target: Target pH value for automatic dosing control.
• ORP target: Target ORP (Redox) value for automatic dosing control.
• Chlorine target: Target chlorine concentration for automatic dosing control.
• pH overfeed alarm lower limit: Lower threshold for pH overfeed detection.
• pH overfeed alarm upper limit: Upper threshold for pH overfeed detection.
• ORP overfeed alarm lower limit: Lower threshold for ORP overfeed detection.
• ORP overfeed alarm upper limit: Upper threshold for ORP overfeed detection.
• Chlorine overfeed alarm lower limit: Lower threshold for chlorine overfeed detection.
• Chlorine overfeed alarm upper limit: Upper threshold for chlorine overfeed detection.

Type of change

• Spelling, grammar or other readability improvements (current branch).
• Adjusted missing or incorrect information in the current documentation (current branch).
• Added documentation for a new integration I'm adding to Home Assistant (next branch).
  • I've opened up a PR to add logos and icons in Brands repository.
• Added documentation for a new feature I'm adding to Home Assistant (next branch).
• Removed stale or deprecated documentation.

Additional information

• Link to parent pull request in the codebase: Pooldose: add number platform core#157787
• Link to parent pull request in the Brands repository:
• This PR fixes or closes issue: fixes #

Checklist

• This PR uses the correct branch, based on one of the following:
  • I made a change to the existing documentation and used the current branch.
  • I made a change that is related to an upcoming version of Home Assistant and used the next branch.
• The documentation follows the Home Assistant documentation standards.

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[Copilot]

Pull request overview

This PR adds documentation for nine new number entities in the SEKO PoolDose integration, enabling users to configure target values and alarm thresholds for their pool's automatic dosing system.

Key changes

• Documents three target value numbers (pH, ORP/Redox, and Chlorine) for automatic dosing control
• Documents six overfeed alarm limit numbers (lower and upper limits for pH, ORP, and Chlorine)
• Updates YAML front matter to include the Number platform