fix: harden AI analysis and seed defaults

modules/ai/server/config.ts

@@ -1,11 +1,8 @@
-import { AI_KNOWLEDGE_EMBEDDING_DIMENSIONS } from "@/modules/core/server/schema";
 
 export type AiRuntimeConfig = {
   baseUrl: string;
   apiKey: string;
   chatModel: string;
-  embeddingModel: string;
-  embeddingDimensions: number;
 };
 
 export type AiRuntimeConfigResult =
@@ -13,7 +10,6 @@ export type AiRuntimeConfigResult =
   | { success: false; reason: string };
 
 const DEFAULT_CHAT_MODEL = "gpt-4.1-mini";
-const DEFAULT_EMBEDDING_MODEL = "text-embedding-3-small";
 
 function readOptionalEnv(name: string): string {
   return process.env[name]?.trim() ?? "";
@@ -31,8 +27,6 @@ export function getAiRuntimeConfig(): AiRuntimeConfigResult {
       baseUrl: readOptionalEnv("AI_BASE_URL"),
       apiKey,
       chatModel: readOptionalEnv("AI_CHAT_MODEL") || DEFAULT_CHAT_MODEL,
-      embeddingModel: readOptionalEnv("AI_EMBEDDING_MODEL") || DEFAULT_EMBEDDING_MODEL,
-      embeddingDimensions: AI_KNOWLEDGE_EMBEDDING_DIMENSIONS,
     },
   };
 }