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

apps/docs/package.json

@@ -8,7 +8,6 @@
     "doctor": "blume doctor"
   },
   "dependencies": {
-    "@openrouter/ai-sdk-provider": "^3.1.0",
     "blume": "^2.1.0",
     "class-variance-authority": "^0.7.1",
     "clsx": "^2.1.1",