Cache: keep a location on the app's own origin as its path (appLocation) #701

Upstream cache/route.ts keeps a location on the app's own origin as its path (appLocation(location, appOrigin)), so a recording made against one deployment replays against another. The port's CacheRoute.Identity keeps the full authority, so a recorded location carries the origin it was recorded on.

This matters now that #645 (PR #699) lets app.url use port 0: each run serves the app on a new port, so a trace recorded on http://127.0.0.1:53211/ never matches a live http://127.0.0.1:49872/, and replays miss on every run. The same holds for preview URLs that change per deploy.

Port appLocation and apply it where the port records and compares routes (Agent/StepCache.cs, Cache/Decide.cs), with the app origin of the session. Upstream tests: tests/unit/cache-route.test.ts (or the file that covers appLocation).

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