Add Open Terminal image analysis to Vision Bridge

[d3cker]

Description

Summary

This PR adds analyze_terminal_image, allowing Vision Bridge to inspect images created or stored in the currently connected Open Terminal.
It also adds system instructions that tell the model when to use:

• analyze_image for images attached to the conversation.
• analyze_terminal_image for image files located in Open Terminal.

Motivation

Images generated through the Open WebUI -> Open Terminal workflow are terminal files, not chat attachments with a file_id. As a result, analyze_image could not resolve them: the bridge returned a missing-image error and the workflow stalled.
The new tool reads the image directly from the connected terminal and forwards it to the configured vision model. This lets the text-only model continue the workflow and visually verify generated or modified images.

Testing

Execute the following prompt:

Create a visually interesting Mandelbrot fractal image in the terminal and save it as a PNG - test.png. Use vivid colors and add a subtle glow around the fractal edges.
After creating it, visually inspect the actual rendered result and decide whether the colors, contrast, and glow look good. If they do not, improve the image and inspect it again.
Do not assume the image looks correct just because the code ran successfully. Base your final answer on actual visual inspection of the rendered image.

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[Classic298]

will have time to review soon