[ui] Fix MCP toggle not shown for models without gallery config

[Copilot]

Description

This PR fixes the MCP/Agent toggle not appearing in the chat UI when users create model configurations that share the same model file. The toggle was incorrectly gated behind a gallery config check, which only exists for gallery-installed models.

Changes

• UI Template (chat.html): Removed {{ if $galleryConfig }} wrapper around MCP toggle logic. The toggle now displays for any model with MCP configuration, regardless of installation source.

• Test Coverage (model_config_test.go): Added test verifying multiple configs pointing to the same model file maintain independent MCP settings.

Example Scenario

# model-base.yaml (from gallery, has ._gallery_model-base.yaml)
name: model-base
parameters:
  model: shared-model.gguf

# model-agent.yaml (user-created, no gallery file)
name: model-agent
parameters:
  model: shared-model.gguf  # same file
mcp:
  stdio: |
    mcpServers:
      test:
        command: mcp-server-test

Before: /chat/model-agent showed no MCP toggle (missing gallery file)
After: /chat/model-agent shows MCP toggle (checks model config directly)

Notes for Reviewers

The fix is a 2-line change in the template. Gallery configs are metadata for gallery-installed models and should not gate feature availability.

Signed commits

• [x] Yes, I signed my commits.

Original prompt

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This section details on the original issue you should resolve

<issue_title>MCP / Agent mode is not working when model file is shared</issue_title> <issue_description>LocalAI version: v3.7.0

Describe the bug

If you configure model twice using same model file, and one configuration spec'ed for MCP / Agent mode, LocalAI fails to recognize that and MCP / Agent feature is not working.

To Reproduce

1. Download model from gallery
2. Copy configuration file for downloaded model
3. Import model by pasting copied configuration file, adding MCP and Agent sections, and changing name (but not changing filename!)
4. Try to chat with model configured for MCP / Agent mode (Chat view is not showing option to enable MCP)
5. (optional) Verify logs in debug mode to see no MCP activity happens
6. (optional) Verify configuration of MCP / Agent mode by downloading yet another model from gallery and editing it's original configuration file by pasting MCP and Agent sections.

Expected behavior One of configurations works in Agent mode (uses MCP), another works in standard way.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes mudler/LocalAI#7143

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