refactor: separate http handler specifics from optimzer

[langdal]

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[Copilot]

Pull request overview

This PR refactors the optimizer codebase by separating HTTP request handling logic from the core optimizer execution logic. The main goal is to improve modularity by moving HTTP-specific concerns (Redis queue management, job handling, client disconnection checks) into a dedicated handler module.

Key Changes:

• Created a new optimizer_handler.py module to handle HTTP requests and job queue management
• Refactored optimizer.py to contain only the core optimizer execution logic
• Updated import references in tests and OpenAPI specification to point to the new handler module

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
optimizerapi/optimizer_handler.py	New file containing HTTP request handlers, Redis/RQ job management, and client disconnection logic previously in optimizer.py
optimizerapi/optimizer.py	Simplified to contain only core optimizer execution logic; removed HTTP-specific dependencies (connexion, Redis, RQ) and handler functions
tests/test_optimizer.py	Updated import statement to use the new optimizer_handler module
optimizerapi/openapi/specification.yml	Updated operationId to reference the new optimizer_handler.run function

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