feat(autorender): add Autorender image CDN provider

[vasanth-rb]

Adds Autorender as an image CDN provider.

URL shape

Autorender serves transformed assets from assets.autorender.io with path-segment transformations:

https://assets.autorender.io/{workspace}/{transformations}/{asset-path}
https://assets.autorender.io/cQQ9C4UxSb/c_fill,w_720,h_480,f_auto/ar-juice.jpg

Transformations are comma-separated key_value tokens. The provider maps the standard operations to w, h, f and q, and exposes c (fill | fit | crop) as a provider-specific operation. f_auto is the default so the origin negotiates the best format from the request headers. When both width and height are given, c_fill is applied so the behaviour matches the cover semantics other providers use.

The transformation segment is optional — extract detects whether the second path segment is a transformation list or the start of the asset path, so untransformed and nested asset URLs round-trip unchanged. Tokens the library doesn't model are parsed through and preserved on transform.

Scope

• Only assets.autorender.io is recognised. Custom domains aren't a product feature yet, so URLs on other hosts return null from extract rather than being guessed at.
• generate needs a workspace: either taken from an existing Autorender URL or passed as options.workspace when generating from a relative asset path. It throws for source URLs on other hosts, since there's nothing meaningful to build from them.

Checks

• deno check src/, deno test src/ (87 passed, 296 steps), deno lint and deno fmt --check all clean on the touched files.
• deno publish --dry-run passes.
• Both e2e.test.ts steps were verified against production for the demo URL: w_720 returns 720px wide, and c_fill,w_100,h_50 returns 100×50.

One unrelated line: deno.jsonc was missing a trailing newline, so adding the export entry also makes it pass deno fmt --check.

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