Sentinel download and rgb fixes

[BryonLewis]

extracted out of #397 this PR's to make it a bit easier for Review of Frame Preview PR's

Sentinel downloader (scripts/sentinelDownload/)

• Supports creating multiframe single-image Sentinel raster datasets via --single-file (uses gdal_translate to append frames as subdatasets)
• Additional CLI arguments for date range, cloud cover, output naming, and clip size
• Generates an ingest JSON alongside clipped GeoTIFFs for direct import into Geoodatalytics

Dataset / RGB fixes

• Default band:1 injection removed when no source_filter is supplied — this was preventing Boston ortho imagery from being recognized as RGB
• band:1 is still applied when explicitly defined in the style spec
• Multiframe rasters no longer render as grayscale — frame and band are extracted from the style JSON and passed as separate query parameters (outside style) so django-large-image can auto-detect RGB imagery
• Stop embedding frame and band inside the large-image style JSON. Those keys select which raster slice to read, so they are now sent as top-level tile query params.
• Treat legacy ingest { "band": 1 } as “no band filter,” so RGB imagery is not forced into single-band grayscale. Explicit non-default band / frame values from source_filters still apply.
• Centralize tile URL building in buildRasterTileQueryParams and use it from both the map and style stores so source creation and style updates stay consistent.

[cloudflare-workers-and-pages]

Deploying geodatalytics with    Cloudflare Pages

Latest commit:	d8e53e7
Status:	✅  Deploy successful!
Preview URL:	https://d52f03f6.geodatalytics.pages.dev
Branch Preview URL:	https://sentinel-download-and-rgb-fi.geodatalytics.pages.dev

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