Feat/ingress regex routes#42
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Gateway RegularExpression path matches and nginx use-regex Ingress paths
were dropped ("no regex path support"), but synapse supports regex
routing via match_expr. Render them as match_expr regex routes instead:
- routeCfg.matchExpr + annSettings.useRegex; addRegexRoute() keyed by the
regex (first-writer-wins), match_expr = http.request.path matches "<re>"
- emit match_expr in both the v1 and v2 upstreams schemas
- rulePaths returns prefixes + regexes; HTTPRoute RegularExpression and
Ingress paths under nginx.ingress.kubernetes.io/use-regex now produce
regex routes (primary host + server-aliases)
Tests: TestRulePaths updated; new TestRegexRouteRender covers v1+v2.
An Ingress/HTTPRoute path regex matches from the beginning of the request path (nginx use-regex / Gateway semantics); k8s also requires the stored Ingress path to begin with "/", so the leading ^ is supplied by the renderer. Prevents an unanchored match (e.g. /x/api/runs/1/stream).
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