Add Alchemy integration for Cloudflare cluster

[IMax153]

Summary

• add an Alchemy-native Worker resource with fixed Durable Object bindings, SQLite migrations, and singleton Cron Trigger configuration
• add a shared isolate runtime for class-based Cloudflare Workers
• document Alchemy deployment and Wrangler adoption
• add Miniflare, unit, and type coverage

Validation

• pnpm --filter @effect/platform-cloudflare check
• pnpm test --run packages/platform/cloudflare/test/CloudflareAlchemy.test.ts packages/platform/cloudflare/test/CloudflareWorker.test.ts packages/platform/cloudflare/test/CloudflareCluster.test.ts packages/platform/cloudflare/test/CloudflareDurableObjects.test.ts
• pnpm test-types CloudflareAlchemy.tst.ts
• pnpm lint

Repository-wide pnpm check still reports pre-existing Buffer type errors in platform-node and sql/pg tests. Alchemy beta.76 requires Effect RC.112, so the resource is typechecked here while its deployment-time execution awaits that version alignment.

[changeset-bot]

🦋 Changeset detected

Latest commit: 211a2c8

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 31 packages

Name	Type
@effect/platform-cloudflare	Major
effect	Major
@effect/ai-anthropic	Major
@effect/ai-openai	Major
@effect/ai-openai-compat	Major
@effect/ai-openrouter	Major
@effect/atom-react	Major
@effect/atom-solid	Major
@effect/atom-vue	Major
@effect/docgen	Major
@effect/doctest	Major
@effect/openapi-generator	Major
@effect/opentelemetry	Major
@effect/platform-browser	Major
@effect/platform-bun	Major
@effect/platform-deno	Major
@effect/platform-node	Major
@effect/platform-node-shared	Major
@effect/sql-clickhouse	Major
@effect/sql-d1	Major
@effect/sql-libsql	Major
@effect/sql-mssql	Major
@effect/sql-mysql2	Major
@effect/sql-pg	Major
@effect/sql-pglite	Major
@effect/sql-sqlite-bun	Major
@effect/sql-sqlite-do	Major
@effect/sql-sqlite-node	Major
@effect/sql-sqlite-react-native	Major
@effect/sql-sqlite-wasm	Major
@effect/vitest	Major

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[tim-smart]

Superseded by #7550: the Worker-wrapping CloudflareAlchemy.worker / CLUSTER_* bindings design lost to the AlchemyCloudflareCluster.make plan locked in the EFF-988 handoff, which #7550 implements.