Add scaling and file storage config docs

[nscuro]

Description

Adds scaling and file storage config docs.

Addressed Issue

N/A

Additional Details

N/A

Checklist

• I have read and understand the contributing guidelines
• This PR fixes a defect, and I have provided tests to verify that the fix is effective
• This PR implements an enhancement, and I have provided tests to verify that it works as intended
• This PR introduces changes to the database model, and I have updated the migration changelog accordingly
• This PR introduces new or alters existing behavior, and I have updated the documentation accordingly

[owasp-dt-bot]

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[Copilot]

Pull request overview

Adds operational documentation pages for scaling and file storage, and wires them into the MkDocs navigation to make the new guidance discoverable.

Changes:

• Add a new Operations → Scaling documentation page with guidance on horizontal scaling, worker separation, and tuning.
• Add a new Operations → Configuration → File Storage page documenting local and S3-backed storage providers.
• Update mkdocs.yml nav to include the new pages.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

File	Description
mkdocs.yml	Adds nav entries for the new File Storage and Scaling docs pages.
docs/operations/scaling.md	New scaling guide covering clustering, worker profiles, concurrency controls, and DB/pool tuning.
docs/operations/configuration/file-storage.md	New file storage configuration guide (local + S3 providers, compression, and config keys).

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