feat(config): add ASK_MODEL env var and update docs assistant endpoint to SRS API

apps/docs/blume.config.ts

@@ -1,5 +1,4 @@
 import { defineConfig } from "blume";
-import { openrouter } from "blume/ai";
 import type { StandardSchema } from "blume/core/standard-schema.ts";
 import { custom, filesystem } from "blume/sources";
 import { githubReleasesSource } from "blume/sources/github-releases.ts";
@@ -135,16 +134,14 @@ export default defineConfig({
     structuredData: true,
     x: { handle: "@prdlk" },
   },
-  // The assistant's `/api/ask` route runs on demand and reads
-  // OPENROUTER_API_KEY at request time (`getSecret`), so it needs a server
-  // runtime holding that secret — a static host cannot answer it.
+  // Blume's own assistant route is server-rendered (it reads the provider key
+  // per request), which a static Pages build cannot ship. The SRS Worker
+  // answers instead (apps/api/src/ask.ts: OpenRouter, grounded on this site's
+  // llms-full.txt, which `agents.llmsTxt` publishes).
   ai: {
     assistant: {
       enabled: true,
-      provider: openrouter({
-        model: "qwen/qwen3.8-27b:free",
-        reasoning: "none",
-      }),
+      endpoint: "https://srs-api.prdlk.workers.dev/ask",
     },
   },
   agents: {