Fix dark mode readability for mermaid diagram

[Copilot]

The mermaid diagram in the README was unreadable in GitHub's dark mode due to light background colors with default black text. The diagram nodes appeared with very poor contrast, making the infrastructure overview difficult to understand.

Before (problematic in dark mode):

classDef folder fill:#e3f2fd,stroke:#1976d2,stroke-width:2px
classDef system fill:#f1f8e9,stroke:#689f38,stroke-width:2px
classDef wazuh fill:#fffde7,stroke:#fbc02d,stroke-width:2px
classDef user fill:#fff3e0,stroke:#f57c00,stroke-width:2px

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After (readable in both modes):

classDef folder fill:#1976d2,stroke:#e3f2fd,stroke-width:2px,color:#ffffff
classDef system fill:#689f38,stroke:#f1f8e9,stroke-width:2px,color:#ffffff
classDef wazuh fill:#fbc02d,stroke:#fffde7,stroke-width:2px,color:#000000
classDef user fill:#f57c00,stroke:#fff3e0,stroke-width:2px,color:#ffffff

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The fix swaps the fill and stroke colors to use darker backgrounds with explicit text colors:

• Uses the same color palette to maintain visual consistency
• Provides excellent contrast in dark mode
• Remains clearly readable in light mode
• Maintains the original design hierarchy and branding

This ensures the cluster architecture diagram is accessible to all users regardless of their GitHub theme preference.

Fixes #19.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• cdn.jsdelivr.net
  • Triggering command: curl -s REDACTED (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

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