chore: cleanup standards (#6970)

* chore: cleanup standards & skills

* remove: figma mcp doc, not needed anymore

.agents/skills/tanstack-query/SKILL.md

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+---
+name: tanstack-query
+description: Convert Vue server-state code to TanStack Query. Use for useQuery, useMutation, cache invalidation, optimistic updates, or replacement of useAsyncData and manual ref patterns.
+---
+
+# Convert Data Code to TanStack Query
+
+Read the applicable `AGENTS.md` files before you edit code.
+
+Read [the TanStack Query standard](../../../standards/frontend/FETCHING_DATA.md) in full.
+
+1. Identify the target file from the request.
+2. Find `useAsyncData`, `useFetch`, manual API refs, and fetch calls in `onMounted`.
+3. Identify mutations that use manual loading, error, or result refs.
+
+For queries:
+
+1. Replace manual fetch logic with `useQuery`.
+2. Get `api-client` with `injectModrinthClient()`.
+3. Use a hierarchical query key with the resource, qualifier, and parameters.
+4. Use a computed query key for reactive parameters.
+5. Use a computed `enabled` option when the query depends on other data.
+6. Use a shared query-option factory when multiple components use the query.
+
+For mutations:
+
+1. Replace manual mutation state with `useMutation`.
+2. Invalidate or update related query data after success.
+3. Use an optimistic update only when the UI needs an immediate response.
+4. Cancel the applicable query and save its prior data before an optimistic update.
+5. Restore the prior data after an error. Invalidate the query after settlement.
+
+Remove manual loading and error refs that TanStack Query replaces. Remove obsolete `onMounted` fetch calls.
+
+Keep Nuxt SSR behavior. Match route-shell prefetch options when `ReadyTransition` and `useReadyState` depend on the query.
+
+Check query keys, invalidation prefixes, reactive values, and rollback data.
+
+Run only the checks that the user or the applicable `AGENTS.md` permits.

.agents/skills/tanstack-query/agents/openai.yaml

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+interface:
+  display_name: "Migrate to TanStack Query"
+  short_description: "Migrate Vue server state to TanStack Query"
+  default_prompt: "Use $tanstack-query to migrate this Vue component to TanStack Query."