Add GPT image generation built-in tool

[ModerRAS]

Summary

• add a generate_image built-in tool backed by OpenAI-compatible /v1/images/generations with default gpt-image-2
• route image API base URL and API key through existing LLM channel configuration
• add admin commands to enable/disable the tool, hide it from prompts/native tools when disabled, and set the default image model
• update docs and add coverage for endpoint normalization and tool visibility filtering

Tests

• dotnet build TelegramSearchBot.sln --configuration Release
• dotnet test TelegramSearchBot.LLM.Test/TelegramSearchBot.LLM.Test.csproj --configuration Release --no-build
• dotnet test TelegramSearchBot.Test/TelegramSearchBot.Test.csproj --configuration Release --no-build

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: a90b9f71-7f64-4018-a1ec-65fd9bdb6d2b

📥 Commits

Reviewing files that changed from the base of the PR and between c260f31 and f4fbbf5.

📒 Files selected for processing (13)

• Docs/Bot_Commands_User_Guide.md
• Docs/README_MCP.md
• README.md
• TelegramSearchBot.Common/Model/Tools/ImageGenerationResult.cs
• TelegramSearchBot.LLM.Test/Service/AI/LLM/McpToolHelperTests.cs
• TelegramSearchBot.LLM/Service/AI/LLM/McpToolHelper.cs
• TelegramSearchBot.Test/Manage/EditLLMConfTest.cs
• TelegramSearchBot.Test/Service/Tools/ImageGenerationToolServiceTests.cs
• TelegramSearchBot/AppBootstrap/GeneralBootstrap.cs
• TelegramSearchBot/Controller/Help/HelpController.cs
• TelegramSearchBot/Model/AI/LLMConfState.cs
• TelegramSearchBot/Service/Manage/EditLLMConfService.cs
• TelegramSearchBot/Service/Tools/ImageGenerationToolService.cs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/add-gpt-image-tool

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[github-actions]

PR Check Report

Summary

• PR: Add GPT image generation built-in tool #357
• Branch: codex/add-gpt-image-tool <- master
• Event: pull_request
• Commit: f414b6d

Test Results

Platform	Status	Details
Ubuntu	Passed	Tests passed, artifacts uploaded
Windows	Passed	Tests passed, artifacts uploaded

Code Quality

• Code formatting check
• Security vulnerability scan
• Dependency analysis
• Code coverage collection

Test Artifacts

• Test results artifacts count: 2
• Code coverage uploaded to Codecov

Links

• PR Page
• Actions Logs

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This report is auto-generated by GitHub Actions