fix(server): compact the startup banner

[nachiketb-nvidia]

What

Reduce the Rust switchyard-server startup wordmark from 120 columns to 60 columns.

Why

The existing banner wraps in a standard 80-column terminal, including the default-sized macOS Terminal window.

How

Preserve the existing six-line block-and-shade artwork while halving its horizontal pixel scale.

What to review

• The compact banner retains the existing visual style.
• The widest line is 60 columns.
• No server behavior or startup content changes.

Validation

• wc -L crates/switchyard-server/assets/startup_banner.txt reports 60.
• git diff --check passes.
• No tests run; this changes only a static text asset.

Summary by CodeRabbit

• Style
  • Updated the startup banner with a refreshed six-line ASCII design and new visual layout.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Enterprise

Run ID: ce6f914a-8b46-443f-b55b-c5faeb29cc98

📥 Commits

Reviewing files that changed from the base of the PR and between eea4e01 and 9be5905.

📒 Files selected for processing (1)

• crates/switchyard-server/assets/startup_banner.txt

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Walkthrough

The startup banner asset now uses a new six-line block-character design.

Changes

Startup banner redesign

Layer / File(s)	Summary
Replace startup banner artwork crates/switchyard-server/assets/startup_banner.txt	The existing six-line artwork was replaced with a new six-line block-character layout.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Poem

I’m a rabbit hopping near,
A fresh banner now appears.
Six neat lines in blocks align,
Startup art looks bright and fine.
Hop, hop—change complete! 🐇

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: reducing the startup banner width.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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