fix: frontend process output streaming stuck due to incorrect output (#1503)

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## Description
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Please provide a clear, human-generated description of the changes in
this PR.
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process and reasoning.
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`cognee-cli -ui` has accidentally added - when opening frontend
subprocess - an output decoding into text.

## What happens exactly

On the surface - frontend ui will be stuck loading.

Frontend process hangs as it's output is not being processed (we're
expecting bytes).

## This change

This change removes the `text=True` added to frontend subprocess

## Type of Change
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- [ ] Bug fix (non-breaking change that fixes an issue)
- [ ] New feature (non-breaking change that adds functionality)
- [ ] Breaking change (fix or feature that would cause existing
functionality to change)
- [ ] Documentation update
- [ ] Code refactoring
- [ ] Performance improvement
- [ ] Other (please specify):

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## Pre-submission Checklist
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- [ ] **I have tested my changes thoroughly before submitting this PR**
- [ ] **This PR contains minimal changes necessary to address the
issue/feature**
- [ ] My code follows the project's coding standards and style
guidelines
- [ ] I have added tests that prove my fix is effective or that my
feature works
- [ ] I have added necessary documentation (if applicable)
- [ ] All new and existing tests pass
- [ ] I have searched existing PRs to ensure this change hasn't been
submitted already
- [ ] I have linked any relevant issues in the description
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## DCO Affirmation
I affirm that all code in every commit of this pull request conforms to
the terms of the Topoteretes Developer Certificate of Origin.

cognee/api/v1/ui/ui.py

@@ -627,7 +627,6 @@ def start_ui(
                 env=env,
                 stdout=subprocess.PIPE,
                 stderr=subprocess.PIPE,
-                text=True,
                 shell=True,
             )
         else:
@@ -637,7 +636,6 @@ def start_ui(
                 env=env,
                 stdout=subprocess.PIPE,
                 stderr=subprocess.PIPE,
-                text=True,
                 preexec_fn=os.setsid if hasattr(os, "setsid") else None,
             )