feat: add searxng web-search provider, openrouter cost balance UI, offline scripts; update source-launch and docs

scripts/gen-doc-graphs.ts

@@ -483,7 +483,7 @@ const SERVICE_ROLES: ServiceRole[] = [
     pkg: 'web',
     title: 'Web access provider registry',
     mode: 'seam',
-    implementations: ['web-search-exa', 'web-search-perplexity', 'web-search-deepseek', 'web-fetch-http'],
+    implementations: ['web-search-exa', 'web-search-searxng', 'web-search-perplexity', 'web-search-deepseek', 'web-fetch-http'],
     consumers: ['tool-web'],
     note: 'Search and fetch providers register into one ctx.web seam; tool-web owns the stable model-facing names.',
   },
@@ -547,6 +547,14 @@ const SERVICE_ROLES: ServiceRole[] = [
     consumers: ['connection'],
     note: 'The transport-agnostic host gateway face: it dispatches browser API calls, and each open host stream subscribes to the events it forwards rather than being pushed to through a broadcast verb.',
   },
+  {
+    key: 'openRouterUsage',
+    pkg: 'openrouter-usage',
+    title: 'OpenRouter usage and balance gateway',
+    mode: 'core',
+    consumers: ['ui-openrouter-usage'],
+    note: 'The host gateway folds token-usage projections and a live balance snapshot; the web UI client reaches the same service over the wire through its remote namespace.',
+  },
   {
     key: 'dynamicCordisRunner',
     pkg: 'cordis-host-runner',