Updates to README for platform architecture overview

[emsearcy]

Include a list of components and diagram.

[Copilot]

Pull Request Overview

This PR updates documentation to include a detailed list of platform components and a Mermaid diagram, and refines chart descriptions.

• Revised chart README and Chart.yaml descriptions for LFX v2
• Updated top-level README’s file tree and component list
• Added new infrastructure and custom components section with a Mermaid architecture diagram

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
charts/lfx-platform/README.md	Adjusted the chart overview wording to highlight platform services and APIs
charts/lfx-platform/Chart.yaml	Changed description casing from “V2” to “v2”
README.md	Restructured file tree, overhauled Components list, and inserted a Mermaid diagram

Comments suppressed due to low confidence (4)

README.md:9

• The ASCII tree now nests charts/ directly under the root, which may misrepresent the repository structure. Consider restoring the lfx-v2-helm/ root entry and adjusting indentation to accurately reflect the directory hierarchy.

└── charts/

README.md:40

• This line is missing a leading hyphen and space to render as a markdown list item. Prefix with - to ensure it appears as a bullet point.

LFX v2 includes the following infrastructure components:

README.md:76

• Mermaid node definitions use {}, [], or (), but the @{ syntax is invalid. Replace @{ with the proper brace syntax, e.g., nats-access-check-subject{ ... }.

        nats-access-check-subject@{ shape: braces, label: "access-check & replies" }

README.md:96

• The query-svc node is defined here after being referenced earlier, leading to a duplicate declaration. Define the node once before references to avoid rendering issues.

    query-svc[<em>query-svc</em>]