fix(stream): v2.22.2 inject a Range for clients that send none

[picklem0b]

The experiment branch's live CDN run measured an edge behaviour this stack shares: a range-less request stalls until the client gives up, while bytes=0- on the same URL returns the whole file in one 206. open_upstream now sends bytes=0- on the client's behalf, and the relay presents that whole-file 206 as a plain 200 (a capped 206 keeps the CDN's framing). Pinned by MockTransport tests at the service boundary and presentation tests at the router.

Also: openapi.json had drifted to 2.22.0 while VERSION said 2.22.1 — regenerated so it can never silently lag again; package-lock now carries the web version it should have had since 2.22.1.

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📒 Files selected for processing (9)

• api/app/main.py
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• api/tests/test_stream_service.py
• web/package.json
• web/src/lib/constants.ts
• web/src/types/openapi.json

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