fix: load Worker entries served over HTTP

[triniwiz]

new Worker() treated every specifier as a file path and read it from disk. Under the Vite dev server, new Worker(new URL('./x.worker.ts', import.meta.url)) passes an http://127.0.0.1:5174/ns/m/... URL, which turned into an invalid Windows path:

Error: Failed to read module file: The filename, directory name, or volume label syntax is incorrect. (os error 123)
    at __resolveWorkerSource
    at new Worker

Reported in triniwiz/nativescript-canvas-starter-template#1.

Changes

• worker_support.rs: an http(s):// specifier skips the resolve and disk read and goes to the threaded host as the worker's filename. Without the threaded host, this now throws a clear error instead of running an empty script.
• worker_threads.rs: the worker bootstrap import()s an HTTP filename through the native module loader, so the entry's own imports resolve against its URL. The dev server already serves worker realms with HTTP vendor imports, so the worker doesn't need an import map. A failed load is queued back as a worker error (delivered as messageerror).
• esm_http_test.rs: worker_entry_served_over_http covers a served worker entry with a relative import, and a missing entry surfacing its 404.

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