Cap HTTP server worker counts to bound open file descriptors

[mcharytoniuk]

No description provided.

[Copilot]

Pull request overview

This PR aims to bound open file descriptor usage by capping the number of Actix HttpServer worker threads used by the balancer’s HTTP-facing services.

Changes:

• Introduced per-service HTTP_WORKERS constants to define an upper bound for worker counts.
• Applied .workers(HTTP_WORKERS) to Actix HttpServer builders across web admin, management, inference, and OpenAI-compat services.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 4 comments.

File	Description
paddler_balancer/src/web_admin_panel_service/mod.rs	Adds a worker cap constant and applies it to the web admin panel HttpServer.
paddler_balancer/src/management_service/mod.rs	Adds a worker cap constant and applies it to the management HttpServer.
paddler_balancer/src/inference_service/mod.rs	Adds a worker cap constant and applies it to the inference HttpServer.
paddler_balancer/src/compatibility/openai_service/mod.rs	Adds a worker cap constant and applies it to the OpenAI-compat HttpServer.

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