feat: Site audit and Crawls screens with their MCP tools

- golem15.seo.issues (Site audit): current issues errors first, labels,
  summary and fix columns, filters, P7 issue_details, Check this address
  again, Ignore, Stop ignoring, bulk Ignore, ignored rows badged
- golem15.seo.crawls (Crawls): newest first, P6 crawl_summary with one
  status callout, staging and rendered-comparison lines, stats strip and
  per-kind table; Cancel; a running crawl refuses delete
- Start crawl toolbar action on both, refusing already_running and
  no_site_url; navigation Site audit (gauge) and Crawls (globe)
- routes and MCP tools start/cancel/list/get/delete crawls, list_issues
  with filters (open by default), recheck_url, ignore and unignore
- AdminOperations maps both controllers; toolbar actions get their own
  operation kind
- TestCrawlAdmin, TestCrawlTools, TestIssueKindLabels

models/issue/columns.yaml

@@ -0,0 +1,43 @@
+# Site audit columns (UI-SPEC C23). severity, kind_cell, summary, source
+# and fix_cell are filled by the controller's ListExtendRecords.
+columns:
+    severity:
+        label: golem15.seo::lang.issues.severity
+        type: text
+        sortable: false
+    kind_cell:
+        label: golem15.seo::lang.issues.kind
+        type: text
+        sortable: false
+    kind:
+        label: golem15.seo::lang.issues.kind_code
+        type: text
+        sortable: true
+        invisible: true
+    url:
+        label: golem15.seo::lang.issues.url
+        type: text
+        searchable: true
+        sortable: true
+    summary:
+        label: golem15.seo::lang.issues.summary
+        type: text
+        sortable: false
+    source:
+        label: golem15.seo::lang.issues.source
+        type: text
+        sortable: true
+    fix_cell:
+        label: golem15.seo::lang.issues.fix
+        type: text
+        sortable: false
+    found_at:
+        label: golem15.seo::lang.issues.found
+        type: datetime
+        sortable: true
+        invisible: true
+    locale:
+        label: golem15.seo::lang.issues.locale
+        type: text
+        sortable: true
+        invisible: true

models/issue/fields.yaml

@@ -0,0 +1,33 @@
+# Issue preview (UI-SPEC C23): every field is read-only.
+fields:
+    url:
+        label: golem15.seo::lang.issues.url
+        type: text
+        span: full
+        context: preview
+    kind:
+        label: golem15.seo::lang.issues.kind
+        type: dropdown
+        span: left
+        context: preview
+    severity:
+        label: golem15.seo::lang.issues.severity
+        type: dropdown
+        span: right
+        context: preview
+    source:
+        label: golem15.seo::lang.issues.source
+        type: dropdown
+        span: left
+        context: preview
+    found_at:
+        label: golem15.seo::lang.issues.found
+        type: datepicker
+        mode: datetime
+        span: right
+        context: preview
+    locale:
+        label: golem15.seo::lang.issues.locale
+        type: text
+        span: left
+        context: preview