refactor(vue): remove tanstack query engine, atom is the only backend

[patroza]

Summary

Removes the TanStack query engine entirely, leaving the Effect Atom engine as the sole query backend. The Atom engine already provided every feature the tanstack path did (cache identity, SWR + focus revalidation, gcTime, retry, structural sharing, hierarchical invalidation, read-dependency derivation).

Changes

• Drop @tanstack/vue-query / @tanstack/query-core dependencies and patches/@tanstack__query-core.patch.
• Delete packages/vue/src/internal/tanstackQuery.ts (makeTanstackQuery, makeTanstackQueryClient, makeTanstackQueryInvalidator, makeTanstackQueryCacheUpdater).
• makeClient no longer accepts legacyQueryEngine and no longer returns tanstackQueryClient; the MakeClientOptions interface is removed.
• QueryImpl no longer takes a legacyUseQuery override — .query() / .suspense() now always run on the Atom engine alongside .atom() / .family() / .queryNew() / .suspenseNew().

Tests

• vue/test/query-span.test.ts — dropped the tanstack span test (atom test retained).
• vue/test/suspense-regression.test.ts — both tests were tanstack-only; converted the structural-sharing test to the atom path (via withQueryOptions), dropped the tanstack key-race regression.
• vue/test/dependencyInvalidation.test.ts — dropped the tanstack recording/eviction/matrix tests; atom tests and the atom invalidation matrix retained.
• e2e/test/repoInvalidation.e2e.test.ts — dropped the tanstack engine e2e; atom engine e2e retained.
• vue/test/makeClient.test.ts — the combineQueryInvalidators test is left as-is (it tests the combiner with two fake invalidators, not the tanstack engine).

Validation

• pnpm check ✅
• pnpm lint-fix ✅
• pnpm --filter @effect-app/vue test run ✅ (83 passed, 2 skipped)
• pnpm --filter @effect-app/e2e test run ✅

Breaking change

makeClient no longer accepts MakeClientOptions / legacyQueryEngine; callers that passed { legacyQueryEngine: "tanstack" } must drop the argument. The Atom engine is the sole backend.

Changeset

• @effect-app/vue: minor
• @effect-app/e2e: patch

[pkg-pr-new]

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@effect-app/cli

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effect-app

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@effect-app/eslint-codegen-model

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@effect-app/eslint-shared-config

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@effect-app/infra

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@effect-app/vue

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@effect-app/vue-components

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commit: f6f1efd