docs: fix values for RUNTIME.osType and RUNTIME.archType. Simplify examples

[esteve]

This is a continuation of #6732, some of the documentation still was inconsistent with the code. I've also simplified some of the examples.

[greptile-apps]

Greptile Summary

This PR corrects RUNTIME.osType and RUNTIME.archType documentation values in two plugin-development guides to match the actual values returned by the Rust os() and arch() functions in crates/vfox/src/config.rs (lowercase "windows"/"linux"/"darwin" and "amd64"/"arm64"/"x86"). It also simplifies multi-branch if-else chains in code examples into compact ternary-style Lua expressions and removes the now-irrelevant "386" arch case (Rust reports 32-bit x86 as "x86", not "386").

Confidence Score: 5/5

Safe to merge — documentation-only corrections that align with the actual runtime values.

All changes are documentation fixes verified against the Rust source in crates/vfox/src/config.rs. The os() function returns lowercase values ("darwin", "linux", "windows") and arch() returns "amd64"/"arm64"/as-is, exactly matching what the docs now say. No logic, tests, or production code are modified. The previously flagged inconsistency between the two docs files is resolved in this PR.

No files require special attention.

Important Files Changed

Filename	Overview
docs/backend-plugin-development.md	Corrects RUNTIME.osType example from "Windows" to "windows" and updates the reference table to list lowercase OS values and quoted arch values including "x86".
docs/tool-plugin-development.md	Fixes all "Windows"/"Darwin" comparisons to lowercase, removes the unreachable "386" arch branch, simplifies verbose if-elseif chains to single-expression Lua ternaries, and updates the RUNTIME reference table.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[RUNTIME.osType] -->|"== 'windows'"| B["'win' (get_os)\n'zip' extension\nWindows paths"]
    A -->|other| C["RUNTIME.osType as-is\n('linux', 'darwin', ...)"]

    D[RUNTIME.archType] -->|"== 'amd64'"| E["'x64'"]
    D -->|other| F["RUNTIME.archType as-is\n('arm64', 'x86', ...)"]

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_{Reviews (5): Last reviewed commit: "apply gemini-code-assist suggestions" | Re-trigger Greptile}

[gemini-code-assist]

Code Review

This pull request updates the documentation and example code to use lowercase values for RUNTIME.osType and RUNTIME.archType, ensuring consistency with the runtime's behavior. It also simplifies several architecture and OS mapping functions by removing redundant conditional branches. The review feedback suggests further refining these examples by using Lua's and/or idiom for more concise conditional assignments and return statements.

[esteve]

@jdx I've rebased this PR on top of main and applied the suggestions provided by gemini-code-assist in aa3291e, let me know if there's anything else that should be improved. Thanks.