fix(deploy): resolve worker bundle path from @cloudflare/vite-plugin dist layout

[AshishKumar4]

Summary

The Deploy to Cloudflare button on generated apps fails with:

FileNotFoundError: File not found: /workspace/<instanceId>/dist/index.js

Root cause

worker/services/sandbox/sandboxSdkClient.ts reads a hardcoded /workspace/<id>/dist/index.js, but @cloudflare/vite-plugin emits the worker to dist/<sanitized-name>/index.js and writes a rewritten wrangler.json alongside it. The same file already reads static assets from the modern dist/client/ layout, so the worker-read path was the inconsistent piece.

The hardcoded dist/index.js has been present since the initial OSS release. The user-facing regression surfaced when the R2-hosted templates switched to use @cloudflare/vite-plugin, shifting builds from the flat dist/index.js layout to the plugin's nested dist/<env>/index.js layout.

Verified against a real generated app (lumina-the-beautiful-hello-world):

• dist/lumina_hello_world_zqneqpyztwbhid_y98ifi/index.js exists
• dist/lumina_hello_world_zqneqpyztwbhid_y98ifi/wrangler.json exists with main: "index.js", assets.directory: "../client"
• dist/client/ exists
• dist/index.js, the path the code tries to read, does not exist

Fix

Resolve both paths from the plugin's own dist/<env>/wrangler.json as the canonical source of truth, falling back to the legacy dist/index.js + dist/client layout for older templates byte-for-byte.

The fix is strictly local to deployToCloudflareWorkers in worker/services/sandbox/sandboxSdkClient.ts. parseWranglerConfig, buildDeploymentConfig, WranglerConfig type, deployer.ts, deploy.ts, cloudflare-api.ts, templates.ts, and the bunx wrangler build step are untouched.

Tests

New unit tests in worker/services/sandbox/resolveBuildArtifacts.test.ts cover:

1. Modern @cloudflare/vite-plugin layout with ../client assets resolving to sibling dist/client.
2. Multiple env dirs such as api and web, picking the one matching config.name.
3. No nested wrangler.json, preserving byte-identical legacy strings.

Verification

• npm run typecheck passed
• npm run lint passed
• npm run test -- worker/services/sandbox/resolveBuildArtifacts.test.ts passed
• npm run test passed: 216 passed / 1 skipped across 10 test files

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