Added Provider: Pollinations (Text & Image)

[aleph23]

Add Pollinations text and image providers (and a couple Windose tweaks to get the rust compiling for me -- feel free to toss them obviously).

What's New:

• Pollinations text and image provider adapters for chat and image generation, including configuration, verification endpoints, and UI icons.
• Allow image generator adapters to specify HTTP methods and support GET-based image requests with optional empty JSON bodies.
• Handle direct image binary responses by converting them to base64 data URLs before downstream processing.
• Extend provider verification and capabilities metadata to support Pollinations provider (Chutes is next)

OS-For-Me Changes:

• Ensure CUDA Tauri runner spawns via a shell because it wouldn't do otherwise.
• Added 'windows-core' dependency because tauri insisted.
• src-tauri/src/llama_cpp/desktop/context.rs seemed to have a number-type mismatch.

[MegalithOfficial]

I will review the PR but please follow Conventional Commits format in your future PRs.

https://www.conventionalcommits.org/en/v1.0.0/

[MegalithOfficial]

Requesting changes for a few integration issues before this is ready:

The main one is that pollinations-image hasn’t been wired in as an image-only provider across the model creation/edit flows. Right now models for it still default to text scopes, which means they won’t show up in image-generation pickers and can end up being saved in an invalid chat-model state.

Also, the Pollinations base URL normalization is too aggressive. It strips any path prefix and rebuilds the URL as just scheme://host[:port], which will break anyone using a reverse proxy or gateway like https://example.com/pollinations.

Finally, verification was added in Settings, but not in onboarding, so the same Pollinations credential is verified in one flow and accepted unchecked in the other.