fix(status_page): return correct devhelmstatus.com domain in page_url

[caballeto]

Bug

devhelm_status_page.page_url returned https://<slug>.devhelm.page, which is a domain that does not resolve. The actual public host for DevHelm-hosted status pages is https://<slug>.devhelmstatus.com.

Found during DevEx round 3.

Repro

resource "devhelm_status_page" "p" {
  name = "Acme Status"
  slug = "acme"
}

output "url" { value = devhelm_status_page.p.page_url }

Before this fix:

url = "https://acme.devhelm.page"   # NXDOMAIN

After:

url = "https://acme.devhelmstatus.com"   # resolves to the public status page

Fix

page_url is computed entirely client-side from slug (the API does not return it; see comment in mapToState). Swap the hard-coded host literal devhelm.page → devhelmstatus.com everywhere it appears:

• internal/provider/resources/status_page.go — mapToState format string + schema description + comment
• internal/provider/datasources/status_page.go — mapStatusPageToState format string
• All four corresponding unit-test expectations
• Templated example output in templates/guides/getting-started.md.tmpl
• Regenerated docs/resources/status_page.md and docs/guides/getting-started.md via make docs

Scope

Fix is provider-side only. StatusPageDto does not expose a pageUrl field — the URL is synthesized in the provider, so the wrong host never came from the API. No mono-side change is required.

Validation

• go build ./... ✓
• go vet ./... ✓
• go test ./... ✓ (all package suites pass)
• make docs-check ✓ (clean tree after regen)

Diff stat

 docs/guides/getting-started.md                            | 2 +-
 docs/resources/status_page.md                             | 2 +-
 internal/provider/datasources/datasources_test.go         | 2 +-
 internal/provider/datasources/negative_datasource_test.go | 2 +-
 internal/provider/datasources/status_page.go              | 2 +-
 internal/provider/resources/negative_validation_test.go   | 2 +-
 internal/provider/resources/status_page.go                | 8 ++++----
 internal/provider/resources/status_page_test.go           | 2 +-
 templates/guides/getting-started.md.tmpl                  | 2 +-
 9 files changed, 12 insertions(+), 12 deletions(-)

No version bump in this PR — will be cut after merge.

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