Added provider icons (#934)

Co-authored-by: Thorsten Sommer <SommerEngineering@users.noreply.github.com>

app/MindWork AI Studio/wwwroot/images/provider-icons/README.md

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+# Provider icon assets
+
+All provider icons are shipped with AI Studio and loaded locally. No icon triggers an external image request.
+
+## Sources
+
+- `alibaba-cloud.svg`, `anthropic*.svg`, `deepseek.svg`, `hetzner.svg`, `mistral.svg`, `perplexity.svg`, and `x*.svg` use paths and brand colors from [Simple Icons 16.21.0](https://github.com/simple-icons/simple-icons/tree/16.21.0), licensed under [CC0-1.0](https://github.com/simple-icons/simple-icons/blob/16.21.0/LICENSE.md).
+- `hugging-face.svg` was taken from their official website (https://huggingface.co/brand) 
+- `openai*.svg` uses the OpenAI mark path from [Simple Icons 15.15.0](https://github.com/simple-icons/simple-icons/blob/15.15.0/icons/openai.svg) and black/white variants following the [OpenAI Design Guidelines](https://openai.com/brand/).
+- `fireworks.svg` is adapted from the [Fireworks AI site icon](https://fireworks.ai/icon0.svg).
+- `groq.svg` is adapted from the [Groq site icon](https://groq.com/favicon.svg).
+- `provider*.svg` and `self-hosted*.svg` are neutral project-owned fallback graphics.
+- `gwdg.svg`, `openrouter.svg`, `google.svg` and `helmholtz.svg` were created by taking the official logo from their respective websites as images and creating a svg from them.
+
+The `-dark` files are contrast variants for dark surfaces. All product names, logos, and trademarks remain the property of their respective owners. Their inclusion identifies compatible services and does not imply endorsement. Sources were retrieved on 2026-08-24.