feat: migrate runtime backend to node server

src/services/ai.ts

@@ -38,6 +38,7 @@ import type {
   StoryRequestOptions,
   TextStreamOptions,
 } from './aiTypes';
+import { fetchWithApiAuth } from './apiClient';
 import {
   buildCharacterPanelChatPrompt,
   buildCharacterPanelChatSuggestionPrompt,
@@ -129,6 +130,8 @@ export type {
   TextStreamOptions,
 } from './aiTypes';
 
+const ENV: Partial<ImportMetaEnv> = import.meta.env ?? {};
+
 type RawOptionItem = {
   functionId: string;
   actionText?: string;
@@ -139,7 +142,7 @@ type MergeableCustomWorldRoleEntry = {
 };
 
 const CUSTOM_WORLD_SCENE_IMAGE_API_BASE_URL =
-  import.meta.env.VITE_SCENE_IMAGE_PROXY_BASE_URL ||
+  ENV.VITE_SCENE_IMAGE_PROXY_BASE_URL ||
   '/api/custom-world/scene-image';
 const CUSTOM_WORLD_JSON_REPAIR_SYSTEM_PROMPT = `你是 JSON 修复器。
 你会收到一段本应为单个 JSON 对象的文本。
@@ -155,7 +158,7 @@ const CUSTOM_WORLD_FRAMEWORK_LANDMARK_NETWORK_BATCH_SIZE = 3;
 const CUSTOM_WORLD_PLAYABLE_BATCH_SIZE = 3;
 const CUSTOM_WORLD_STORY_BATCH_SIZE = 5;
 const CUSTOM_WORLD_SCENE_IMAGE_REQUEST_TIMEOUT_MS = (() => {
-  const rawValue = Number(import.meta.env.VITE_SCENE_IMAGE_REQUEST_TIMEOUT_MS);
+  const rawValue = Number(ENV.VITE_SCENE_IMAGE_REQUEST_TIMEOUT_MS);
   return Number.isFinite(rawValue) && rawValue > 0 ? rawValue : 150000;
 })();
 
@@ -1776,6 +1779,60 @@ async function requestCompletion(
   );
 }
 
+export async function generateInitialStoryStrict(
+  world: WorldType,
+  character: Character,
+  monsters: SceneHostileNpc[],
+  context: StoryGenerationContext,
+  requestOptions: StoryRequestOptions = {},
+): Promise<AIResponse> {
+  return requestCompletion(
+    buildUserPrompt(
+      world,
+      character,
+      monsters,
+      [],
+      context,
+      undefined,
+      requestOptions.availableOptions,
+      requestOptions.optionCatalog,
+    ),
+    world,
+    character,
+    monsters,
+    context,
+    requestOptions,
+  );
+}
+
+export async function generateNextStepStrict(
+  world: WorldType,
+  character: Character,
+  monsters: SceneHostileNpc[],
+  history: StoryMoment[],
+  choice: string,
+  context: StoryGenerationContext,
+  requestOptions: StoryRequestOptions = {},
+): Promise<AIResponse> {
+  return requestCompletion(
+    buildUserPrompt(
+      world,
+      character,
+      monsters,
+      history,
+      context,
+      choice,
+      requestOptions.availableOptions,
+      requestOptions.optionCatalog,
+    ),
+    world,
+    character,
+    monsters,
+    context,
+    requestOptions,
+  );
+}
+
 export async function generateCustomWorldSceneImage({
   profile,
   landmark,
@@ -1794,7 +1851,7 @@ export async function generateCustomWorldSceneImage({
   );
 
   try {
-    const response = await fetch(CUSTOM_WORLD_SCENE_IMAGE_API_BASE_URL, {
+    const response = await fetchWithApiAuth(CUSTOM_WORLD_SCENE_IMAGE_API_BASE_URL, {
       method: 'POST',
       headers: { 'Content-Type': 'application/json' },
       body: JSON.stringify({