Refactor assistant configuration and database seeding

- Update Makefile to include new database seed commands for assistants and credentials.
- Refactor assistant model to use explicit fields instead of a config dictionary, improving data integrity and clarity.
- Implement new seeding SQL script for assistants, ensuring dependencies on credentials are respected.
- Modify backend routes and frontend components to accommodate the new assistant structure, including direct field access for prompt, API URL, and keys.
- Enhance the AssistantPage component to handle the new data structure and streamline the save process for different assistant types.

frontend/src/lib/api.ts

@@ -82,7 +82,7 @@ export type AssistantType =
   | "opencode";
 export type RuntimeMode = "pipeline" | "realtime";
 
-/** 后端 AssistantOut。config 形态随 type 变,故用宽松 record */
+/** 后端 AssistantOut(宽表 STI:瘦字段平铺,workflow 用 graph)。apiKey 读时打码 */
 export type Assistant = {
   id: string;
   name: string;
@@ -95,23 +95,15 @@ export type Assistant = {
   ttsCredentialId: string | null;
   realtimeCredentialId: string | null;
   knowledgeBaseId: string | null;
-  config: Record<string, unknown>;
+  prompt: string;
+  apiUrl: string;
+  apiKey: string;
+  appId: string;
+  graph: Record<string, unknown>;
   updatedAt?: string | null;
 };
 
-export type AssistantUpsert = {
-  name: string;
-  type: AssistantType;
-  runtimeMode: RuntimeMode;
-  greeting: string;
-  enableInterrupt: boolean;
-  llmCredentialId: string | null;
-  asrCredentialId: string | null;
-  ttsCredentialId: string | null;
-  realtimeCredentialId: string | null;
-  knowledgeBaseId: string | null;
-  config: Record<string, unknown>;
-};
+export type AssistantUpsert = Omit<Assistant, "id" | "updatedAt">;
 
 export const assistantsApi = {
   list: () => request<Assistant[]>("/api/assistants"),