Clarify JSON POST paths and the v response, add a jump table

[bharvey88]

Fixes #240.

The reporter's analysis is correct, verified on a WLED 16.0.1 device and against the source:

• The JSON body handler is registered for the whole /json prefix with any non-GET method, not just /json and /json/state (wled_server.cpp#L410-L465). A URL containing cfg routes to config deserialization instead (L428-L446).
• On "v":true the code calls serveJson(request) (L456), so the response is the object of the requested path, not always the state object.

Measured on a live 16.0.1 device, same {"v":true} POST body to four paths:

POST path	Response
/json/state	state object
/json/si	state + info
/json/pal	palette name list
/json	state + info + effects + palettes

and POST /json/pal {"bri":200} returns {"success":true} with the brightness change applied.

The page now says so in "Setting new values" and in the v row, while still recommending /json/state.

Also adds a short "I want to... / Go to" table at the top of the page. At 600+ lines this page is a reference readers land on mid-task, and the table routes them to the right section without scrolling. All anchors verified against the rendered page.

Based on #367's head since both touch this page; its commits show here until it merges.

Summary by CodeRabbit

• Documentation
  • Added quick navigation for common JSON API tasks.
  • Expanded POST request guidance for state and configuration updates.
  • Clarified route-specific response contents.
  • Documented that v returns the complete JSON response for the requested path.

[coderabbitai]

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• docs/interfaces/json-api.md

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Walkthrough

The JSON API documentation adds quick navigation and clarifies POST updates for JSON subpages, configuration updates through /json/cfg, and v responses for the requested path.

Changes

JSON API documentation

Layer / File(s)	Summary
Document JSON API behavior docs/interfaces/json-api.md	Added quick navigation. Clarified POST behavior on JSON subpages, configuration updates through /json/cfg, and path-specific responses from the v parameter.

Estimated code review effort: 1 (Trivial) | ~5 minutes

Merge Risk: 🟡 Moderate · up to 3b0b2

The documentation still contains inaccurate JSON API guidance about configuration routing and response shapes, and one table row violates the repository’s markdown style rules. These issues could mislead integrators and prevent clean validation, so the PR should not merge until they are corrected or explicitly accepted.

Poem

A rabbit hops through JSON trails,
Quick links guide each quest.
POST updates the chosen page,
v returns its full response,
Clear docs do the rest.

🚥 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 summarizes the documentation changes to JSON POST paths, the v response, and navigation.
Linked Issues check	✅ Passed	The documentation updates address issue #240 by clarifying subpage updates and path-specific verbose JSON responses.
Out of Scope Changes check	✅ Passed	All documented changes support the linked issue and PR objectives; no unrelated changes are identified.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0 files. (1 skipped: 1 unsupported.)

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Actionable comments posted: 1

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Inline comments:
In `@docs/interfaces/json-api.md`:
- Line 168: Update the description of the v parameter in the JSON API
documentation to say it returns the full JSON response or value, rather than
implying every endpoint returns an object; preserve the existing endpoint
examples and note that array-valued responses such as /json/eff and /json/pal
are supported.

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• docs/interfaces/json-api.md

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