chore(FR-457): clean up unused configuration of config.toml

[ironAiken2]

resolves #3090 (FR-457)

Removes unused configuration options and UI elements:
You can check detail information about deleted configurations in loop component

• Removed siteDescription from config.toml
• Removed enableModelStore and enableLLMPlayground flags
• Removed logo title related properties from theme configuration
• Removed model store tab from VFolder list page
• Updated project selection to use blocklist for model store access
• Added blocklist check for chat feature in endpoint details

Checklist:

• Documentation
• Minium required manager version
• Test case(s) to demonstrate the difference of before/after

[ironAiken2]

• chore(FR-457): clean up unused configuration of config.toml #3325 👈 (View in Graphite)
• main

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[agatha197]

siteDescription is also never used. Some files still have siteDescription. Let's find it in all files and please remove them.