kit初版，模型引入,agent优化

art-agent/frontend/src/lib/store.ts

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+/**
+ * 基于 localStorage 的客户端持久化存储。
+ * 提供会话、标签、图片资源的 CRUD 操作。
+ */
+
+import type { Session, Tag, ImageAsset, ChatMessage } from "./types";
+
+const STORAGE_KEYS = {
+  sessions: "epeekit-sessions",
+  tags: "epeekit-tags",
+  assets: "epeekit-assets",
+} as const;
+
+// --------------- 内置标签 ---------------
+
+const BUILTIN_TAGS: Tag[] = [
+  { id: "tag-ui", name: "UI", color: "#6366f1", builtin: true },
+  { id: "tag-icon", name: "Icon", color: "#f59e0b", builtin: true },
+  { id: "tag-illustration", name: "原画", color: "#10b981", builtin: true },
+  { id: "tag-style", name: "风格探索", color: "#ec4899", builtin: true },
+  { id: "tag-character", name: "立绘", color: "#8b5cf6", builtin: true },
+  { id: "tag-concept", name: "概念图", color: "#06b6d4", builtin: true },
+];
+
+// --------------- 通用 helpers ---------------
+
+function readJSON<T>(key: string, fallback: T): T {
+  if (typeof window === "undefined") return fallback;
+  try {
+    const raw = localStorage.getItem(key);
+    return raw ? (JSON.parse(raw) as T) : fallback;
+  } catch {
+    return fallback;
+  }
+}
+
+function writeJSON<T>(key: string, data: T) {
+  if (typeof window === "undefined") return;
+  localStorage.setItem(key, JSON.stringify(data));
+}
+
+// --------------- ID 生成 ---------------
+
+let counter = 0;
+export function generateId(prefix = ""): string {
+  counter++;
+  const ts = Date.now().toString(36);
+  const rand = Math.random().toString(36).slice(2, 6);
+  return `${prefix}${ts}-${rand}-${counter}`;
+}
+
+// --------------- 标签 ---------------
+
+export function loadTags(): Tag[] {
+  const custom = readJSON<Tag[]>(STORAGE_KEYS.tags, []);
+  const builtinIds = new Set(BUILTIN_TAGS.map((t) => t.id));
+  const merged = [...BUILTIN_TAGS, ...custom.filter((t) => !builtinIds.has(t.id))];
+  return merged;
+}
+
+export function saveTags(tags: Tag[]) {
+  const custom = tags.filter((t) => !t.builtin);
+  writeJSON(STORAGE_KEYS.tags, custom);
+}
+
+export function addTag(name: string, color: string): Tag {
+  const tag: Tag = { id: generateId("tag-"), name, color, builtin: false };
+  const existing = loadTags();
+  saveTags([...existing, tag]);
+  return tag;
+}
+
+export function deleteTag(tagId: string) {
+  const tags = loadTags().filter((t) => t.id !== tagId && !t.builtin);
+  saveTags(tags);
+}
+
+// --------------- 会话 ---------------
+
+export function loadSessions(): Session[] {
+  return readJSON<Session[]>(STORAGE_KEYS.sessions, []);
+}
+
+export function saveSessions(sessions: Session[]) {
+  writeJSON(STORAGE_KEYS.sessions, sessions);
+}
+
+export function createSession(): Session {
+  const now = Date.now();
+  const session: Session = {
+    id: generateId("sess-"),
+    title: "新对话",
+    tags: [],
+    messages: [],
+    createdAt: now,
+    updatedAt: now,
+  };
+  const sessions = loadSessions();
+  saveSessions([session, ...sessions]);
+  return session;
+}
+
+export function updateSession(session: Session) {
+  const sessions = loadSessions();
+  const idx = sessions.findIndex((s) => s.id === session.id);
+  if (idx >= 0) {
+    sessions[idx] = { ...session, updatedAt: Date.now() };
+  } else {
+    sessions.unshift({ ...session, updatedAt: Date.now() });
+  }
+  saveSessions(sessions);
+}
+
+export function deleteSession(sessionId: string) {
+  const sessions = loadSessions().filter((s) => s.id !== sessionId);
+  saveSessions(sessions);
+  // 同时删除关联的图片资源
+  const assets = loadAssets().filter((a) => a.sessionId !== sessionId);
+  saveAssets(assets);
+}
+
+// --------------- 图片资源 ---------------
+
+export function loadAssets(): ImageAsset[] {
+  return readJSON<ImageAsset[]>(STORAGE_KEYS.assets, []);
+}
+
+export function saveAssets(assets: ImageAsset[]) {
+  writeJSON(STORAGE_KEYS.assets, assets);
+}
+
+export function addAsset(asset: ImageAsset) {
+  const assets = loadAssets();
+  assets.unshift(asset);
+  saveAssets(assets);
+}
+
+export function updateAsset(assetId: string, patch: Partial<ImageAsset>) {
+  const assets = loadAssets();
+  const idx = assets.findIndex((a) => a.id === assetId);
+  if (idx >= 0) {
+    assets[idx] = { ...assets[idx], ...patch };
+    saveAssets(assets);
+  }
+}
+
+export function deleteAsset(assetId: string) {
+  saveAssets(loadAssets().filter((a) => a.id !== assetId));
+}
+
+export function toggleFavorite(assetId: string): boolean {
+  const assets = loadAssets();
+  const idx = assets.findIndex((a) => a.id === assetId);
+  if (idx >= 0) {
+    assets[idx].favorited = !assets[idx].favorited;
+    saveAssets(assets);
+    return assets[idx].favorited;
+  }
+  return false;
+}