docs(stream): update stream openapi

[zeljko-at-bunny]

• 10 endpoints removed
• A tag removed
• ~19 schemas removed that were used exclusively by those endpoints

Noise, not a real change: 10 more schemas disappeared (Video, VideoStatus, VideoDrmType, VRTypes, VideoInfoModel, VideoLibraryStatus, ProblemDetails, AddHeatmapDataModel, AddVideoViewTimeModel, AddViewDataModel) and these were already orphaned/unreferenced by any path in the old spec too. They weren't wired to any documented endpoint before or after, so their removal is just the codegen no longer emitting dead DTOs, not an API change.

Other changes:

1. POST /library/{libraryId}/videos/fetch — gained 422 ("Unable to fetch video from origin") and 429 ("Too many fetch jobs queued...") responses; the existing 400 gained a body (StatusModel) and a more specific description ("URL validation failed or request was invalid" vs. generic "Failed fetching the video").
2. POST .../captions/{srclang} (Add Caption) — 200 and 400 responses now both return StatusModelOfCaptionValidationModel (a new schema wrapping StatusModel + CaptionValidationModel data) instead of separate StatusModel/CaptionValidationModel types.
3. POST .../resolutions/cleanup — two new query parameters added: allResolutions (boolean) and outputs (string — "Outputs to clean. Supported values: hls, mp4, all").
4. POST .../thumbnail (Set Thumbnail) — gained 400 ("The request or URL was invalid") and 422 ("Unable to fetch thumbnail from origin") responses.

No paths were added, no methods changed on any other endpoint, and info.version bumped 1.0.0 → 1.5.13.

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